To see product details, add this item to your cart. You can always remove it later.
FREE Returns
Added to

Sorry, there was a problem.

There was an error retrieving your Wish Lists. Please try again.

Sorry, there was a problem.

List unavailable.
Other Sellers on Amazon
Added
Sold by: Ultracell LLC
Sold by: Ultracell LLC
(662 ratings)
92% positive over last 12 months
Shipping rates and Return policy
Added
Sold by: Garland Home Center
Sold by: Garland Home Center
(397 ratings)
70% positive over last 12 months
Shipping rates and Return policy
Added
Sold by: 1TopTools
Sold by: 1TopTools
(2925 ratings)
93% positive over last 12 months
Shipping rates and Return policy

Bosch T3921SC 4 -3/8 in. Carbide SDS-Plus SPEEDCORE Thin-Wall Core Bit for Removal of Masonry, Brick and Block

4.5 4.5 out of 5 stars 272 ratings

To see product details, add this item to your cart. You can always remove it later.
FREE Returns
on 2 select item(s) Shop items

1

Purchase options and add-ons

Material Carbide
Finish Type Titanium
Shank Type SDS
Brand BOSCH
Item Dimensions LxWxH 4.44 x 4.44 x 5.63 inches

About this item

  • VERSATILE: Ejector hole delivers core removal of masonry, brick, and block
  • LONGEVITY: Features tungsten carbide teeth for long-life
  • IDEAL FOR: For use with SDS plus rotary hammers, corded and cordless hammer drills; use on rotary mode only
  • USE WITH: Works with Bosch SPEEDCORE SDS-plus pilot bits and extensions
  • CONVENIENT: Pilot bit is integrated with mandrel

Frequently bought together

$71.31
Get it as soon as Tuesday, Apr 2
Only 12 left in stock (more on the way).
Ships from and sold by Amazon.com.
+
$51.29
Get it as soon as Tuesday, Apr 2
In Stock
Ships from and sold by Amazon.com.
Total price:
To see our price, add these items to your cart.
Details
Added to Cart
One of these items ships sooner than the other.
Choose items to buy together.

Product details

  • Is Discontinued By Manufacturer ‏ : ‎ No
  • Product Dimensions ‏ : ‎ 4.44 x 4.44 x 5.63 inches; 1.08 Pounds
  • Item model number ‏ : ‎ T3921SC
  • Department ‏ : ‎ Unisex Adult
  • Date First Available ‏ : ‎ March 9, 2012
  • Manufacturer ‏ : ‎ Bosch
  • ASIN ‏ : ‎ B007IS0200
  • Country of Origin ‏ : ‎ Germany
  • Customer Reviews:
    4.5 4.5 out of 5 stars 272 ratings

Product Description

Bosch SDS-Plus rotary hammer core bits are designed for core drilling with smaller hammers; rotary hammers, and corded and cordless hammer drills. Use on rotary mode of your tool to prevent core breakage. Core bits are sold separately and still need the Center Pin, Guide Plate and Shank to get the most out of your bit. Bosch coring bits are made for through hole drilling applications in masonry and concrete.


From the brand


From the manufacturer

BOSCH WHAT HARD WORKERS DESERVE

What's in the box

  • Product & Instructions Guide
  • Looking for specific info?

    Customer reviews

    4.5 out of 5 stars
    4.5 out of 5
    272 global ratings

    Customers say

    Customers like the speed and quality of the drill bit. For example, they say it's a great product that can cut through masonry really fast and makes clean holes. Customers are also impresseded with the value, saying it'll make a perfect hole through concrete. One downside is the ease of removal, with customers complaining that it'd be difficult to remove the speed core and extension bits after use.

    AI-generated from the text of customer reviews

    35 customers mention35 positive0 negative

    Customers are satisfied with the quality of the drill bit. They mention that it works well, has no frustration, and does not jam up. Some say that it is a great tool and works well with a hole saw bit. Overall, customers are happy with their purchase and recommend it to others.

    "...Worked great! I placed the vent in a smaller stone as requested against my caution that it might rip it apart since it was so small...." Read more

    "...Worked great! I placed the vent in a smaller stone as requested against my caution that it might rip it apart since it was so small...." Read more

    "Good tool" Read more

    "Nicely made part as are almost all Bosch products...." Read more

    9 customers mention9 positive0 negative

    Customers like the cutting speed of the drill bit. For example, they say it's durable, and it cuts through masonry really fast. Some mention that it'll cut through brick like butter. That said, some are happy with the speed. One downside is that it can be dusty.

    "...It cut through it perfectly. I had to use some sds chisels to pop out the core so I could keep coring...." Read more

    "...It cut through it perfectly. I had to use some sds chisels to pop out the core so I could keep coring...." Read more

    "Cuts through brick like butter. That said, it wont make it all the way through the thickness (width) of a brick one pass. It is not deep enough...." Read more

    "It cuts clean holes & holds up well. Cuts twice as fast if you use water" Read more

    9 customers mention7 positive2 negative

    Customers like the value of the drill bits. They say it's a great product and an easy recommended buy.

    "...But for lighter-duty use, this bit does the trick at a great price." Read more

    "Can't beat Bosch for concrete buts. 5 stars! And the price is lower than the local supply house, I'll buy more when these eventually wear out...." Read more

    "Very good product and good pricing" Read more

    "This is not a real tool. I bought this for home use but use good ones at work. The difference is dramatic. Don't buy the Bosch core saws...." Read more

    4 customers mention4 positive0 negative

    Customers are satisfied with the hole that the drill bit makes. They mention that it is able to make a nice hole through concrete. Some customers also say that the tool is rotary hammer and it drilled a beautiful smooth walled hole.

    "...was made with quartz stone so the bit is no longer usable but the hole was perfect. For the cost can’t do better...." Read more

    "Did exactly what it is supposed to do, and that's make a nice hole through concrete...." Read more

    "...I used a Cheap China Tools rotary hammer, and it drilled a beautiful smooth walled hole that had just enough clearance for 4" vent pipe...." Read more

    "Very nice tool. It allowed me to open a perfect hole thru a 8" thick poured wall 40 year old." Read more

    3 customers mention3 positive0 negative

    Customers like the appearance of the drill bit. They say it looks professional when completed, and the bit still looks brand new.

    "...THe cut was very clean, and slightly larger than 4 3/8. I'm very happy with this bit...." Read more

    "...After three cores the bit looks brand new. I’m sure it performs well in concrete or CMU also, but for soft brick it was perfect." Read more

    "Excellent quality, made job easy and looks professional when completed." Read more

    4 customers mention0 positive4 negative

    Customers find the removal of the drill bits difficult. They mention that the screws may be difficult to remove after use, and there is no information on the removal process. They also say it's difficult to separate the speed core and the extension bits after use.

    "...There is no info on removal process to help advise how to do it easily. Otherwise, I would have given this 5 stars." Read more

    "...The extension easily screws on, however, may be difficult to remove after use...." Read more

    "Extremely difficult to separate speed core and the extension bits after use. How to use two monkey wrenches . That's only after 1 hour use" Read more

    "Thread do not fit exactly...is realy hard to unscrew it, if you want to change the core bit.Every time I need to use a vise and a big wrench." Read more

    Pictures of product misleading
    1 Star
    Pictures of product misleading
    The pictures CLEARLY show the core bit with the mandrel. NO WHERE does it say purchase mandrel separately. Also it clearly states that the core bit assembly is SDS Plus. The Mandrel is SDS Plus, the core is compatible with any 5/8" diameter hammer drill threaded shank. So it is very misleading because you think you are getting a core bit and mandrel BECAUSE THEY DESCRIBE IT AS that it is SDS plus shank. I will likely send this back. I can get a combination assembly for the same amount of cost as just this core bit.
    Thank you for your feedback
    Sorry, there was an error
    Sorry we couldn't load the review

    Top reviews from the United States

    Reviewed in the United States on October 2, 2023
    Size: 1-9/16 In. DiameterNumber of Items: 1Verified Purchase
    Reviewed in the United States on June 3, 2018
    Size: 13 In. DiameterNumber of Items: 1Verified Purchase
    Reviewed in the United States on June 3, 2018
    Size: 4-3/8 In. DiameterNumber of Items: 1Verified Purchase
    One person found this helpful
    Report
    Reviewed in the United States on February 6, 2017
    Size: 2-9/16 In. DiameterNumber of Items: 1Verified Purchase
    Reviewed in the United States on November 26, 2018
    Size: 4-3/8 In. DiameterNumber of Items: 1Verified Purchase
    3 people found this helpful
    Report
    Reviewed in the United States on February 7, 2020
    Size: 4-3/8 In. DiameterNumber of Items: 1Verified Purchase
    One person found this helpful
    Report
    Reviewed in the United States on June 15, 2020
    Size: 1-9/16 In. DiameterNumber of Items: 1Verified Purchase
    One person found this helpful
    Report
    Reviewed in the United States on January 9, 2023
    Size: 1 In. DiameterNumber of Items: 1Verified Purchase

    Top reviews from other countries

    ThePopesBoner
    5.0 out of 5 stars worked well enough with underpowered sds-plus drill
    Reviewed in Canada on October 5, 2018
    Size: 4-3/8 In. DiameterNumber of Items: 1Verified Purchase
    3 people found this helpful
    Report
    Amazon Customer
    5.0 out of 5 stars Very happy with this!
    Reviewed in Canada on April 23, 2017
    Size: 1-7/8 In. DiameterNumber of Items: 1Verified Purchase
    ZMon
    5.0 out of 5 stars I absolutely recommend it
    Reviewed in Canada on August 3, 2020
    Size: 4-3/8 In. DiameterNumber of Items: 1Verified Purchase
    Jeff Cassidy
    5.0 out of 5 stars Fast, easy, clean drilling through brick
    Reviewed in Canada on May 24, 2017
    Size: 1-3/8 In. DiameterNumber of Items: 1Verified Purchase
    Quentin Hogg
    4.0 out of 5 stars Very good bit
    Reviewed in Canada on June 20, 2020
    Size: 1-7/8 In. DiameterNumber of Items: 1Verified Purchase