I have bought other brands of drill bits and found that they are smaller Be careful , when you buy them. maybe I got a bad one and the rest was fine, I don't know. Size smaller I ordered Dewalt thought it would be better but it was between sizes. I sent it back and ordered a wooden owl, it fits perfectly. Wooden owl bits are made in Japan, not China will buy wooden owl again, the quality is excellent. Amazon, the return was very good. No problem.