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Starrett KA19-N "Oops" Arbor, Hole Enlargement Arbor

4.5 4.5 out of 5 stars 163 ratings
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Amazon's Choice in Hole Saw Arbors by Starrett

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Brand Starrett
Style Compact
Item Weight 0.04 Pounds
Number of Pieces 1

About this item

  • "Oops" Arbor, Hole Enlargement Arbor
  • Replaces the pilot drill in any Starrett A1, A2 or A10 type arbors
  • Replacing the pilot drill, the KA19 allows diameters to be enlarged by attaching a saw of the same size to that of the existing hole
  • This saw then acts as the pilot for the larger diameter saw that is attached to the arbor in the normal way

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Product details

  • Package Dimensions ‏ : ‎ 5.4 x 2.5 x 0.5 inches; 0.64 ounces
  • Item model number ‏ : ‎ KA19-N
  • Date First Available ‏ : ‎ March 29, 2013
  • Manufacturer ‏ : ‎ Starrett
  • ASIN ‏ : ‎ B01HOLS2WU
  • Customer Reviews:
    4.5 4.5 out of 5 stars 163 ratings

Product Description

Starrett KA19-N "Oops" Arbor, Hole Enlargement Arbor. Replaces the pilot drill in any Starrett A1, A2 or A10 type arbors. Replacing the pilot drill, the KA19 allows diameters to be enlarged by attaching a saw of the same size to that of the existing hole. This saw then acts as the pilot for the larger diameter saw that is attached to the arbor in the normal way.


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The L.S. Starrett Company, founded in 1880, manufactures more than 5,000 variations of Precision Tools, Gages, Measuring Instruments and Saw Blades for industrial, professional and consumer markets worldwide. Starrett, a manufacturer of fine precision tools in industry for over 130 years.

Starrett KA19-N "Oops" Hole Saw Arbor

Starrett KA19-N "Oops" Arbor, Hole Enlargement Arbor. Replaces the pilot drill in any Starrett A1, A2 or A10 type arbors. Replacing the pilot drill, the KA19 allows diameters to be enlarged by attaching a saw of the same size to that of the existing hole. This saw then acts as the pilot for the larger diameter saw that is attached to the arbor in the normal way.

  • Oops Arbor, Hole Enlargement Arbor
  • Replaces the pilot drill in any Starrett A1, A2 or A10 type arbors
  • Replacing the pilot drill, the KA19 allows diameters to be enlarged by attaching a saw of the same size to that of the existing hole
  • This saw then acts as the pilot for the larger diameter saw that is attached to the arbor in the normal way

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Customer reviews

4.5 out of 5 stars
4.5 out of 5
163 global ratings

Customers say

Customers like the quality, ease of use, holes and versatility of the saw blade. For example, they mention it works great, saves time and is a simple solution to a frustrating problem. That said, they say it comes in handy and is useful for door-lock work.

AI-generated from the text of customer reviews

14 customers mention14 positive0 negative

Customers are satisfied with the quality of the saw blade. They mention that it works great, is convenient, and should last forever. Some say that it's made of solid steel and works well with small hole saws. Overall, customers are happy with their purchase and recommend it to others.

"This tool works great and should last forever. I used it while replacing all the door handles in my house to enlarge the holes for the new sets...." Read more

"Convenient and good tool to have but it is small and doesn’t feel like it would survive anything above a 2.5” hole saw...." Read more

"Amazing little product...Worked great and as expected. Add it to your tool box. You will need it some day." Read more

"High quality" Read more

4 customers mention4 positive0 negative

Customers find the saw blade easy to use. They say it's convenient, a simple solution to a frustrating problem, and saves time when fixing a mistake.

"Convenient and good tool to have but it is small and doesn’t feel like it would survive anything above a 2.5” hole saw...." Read more

"...My set of hole saws couldn't accommodate the two needed. This made it super easy. Not sure if I'll ever need it again, but kind of hope I will." Read more

"...Cleaver and affordable. Saves so much time when fixing a mistake. Too small a hole can sometimes be hard to align with bigger and labor intensive" Read more

"Functions well and is a simple solution to a frustrating problem." Read more

4 customers mention4 positive0 negative

Customers like the holes that the saw blade can make. They mention it's a great solution for expanding holes and helps with enlarging older door holes to fit new standard lock sizes.

"Great tool for making holes wider except must use one smaller with one bigger...." Read more

"Really helped with enlarging older door holes to fit new standard lock sizes. Much better than buying the notmal $85 retro-fit tool." Read more

"A great solution for expanding holes. Works great with my DeWalt hole saws." Read more

"Perfect for enlarging holes..." Read more

3 customers mention3 positive0 negative

Customers find the saw blade versatile and useful for door-lock work. They also say it comes in handy and is an awesome tool.

"Really comes in handy when needed. I had to enlarge a 2" hole to 3" on a counter top. Much less mess than a jig and router...." Read more

"...Enlarged several holes I had drilled too small. Awesome tool!" Read more

"GREAT & useful hole saw accessory. Quality made and so useful for door-lock work." Read more

It works
5 Stars
It works
I works. I needed a 1 3/4 hole and there was a 7/8 hole already. I replaced my pilot bit with the Starrett KA19-N and used the 7/8 hole saw to guide the 1 3/4 hole saw. It works well. I do not use it everyday but when I need to drill a larger hole this is the way to go. With this I can do in field modifications and not have to go back to the shop to use the drill press when I need to make a 7/8 hole into a 1 3/4 hole.
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Chris Townsend
5.0 out of 5 stars Five Stars
Reviewed in the United Kingdom on October 26, 2017
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