Bit shank not long enough. My drill was barely enough to get a grip after adding the retaining ring. It ended up tearing the end of the bit apart until it could no longer be used. The jig is also quite flimsy, I had to clamp it on both sides so it could drill perfectly at a 90 degree angle. I dropped it after a few holes. I found it easier to just measure the location of the hole with a ruler or adjustable square and drill the hole without a guide. IMO you are better off spending your money on a good Forstner racquet.
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