Features: 1) Contents: a) 1 aluminum plate b) 1 center drill c) 1 half round file for finishing edges d) 5 hole saws: 1-5/16"(33mm); 2-5/64"(53mm); 2-5/8"(67mm); 2-7/8"(73mm), and 3-9/32"(83mm). 2) Provides easy thorough hole drilling. 500rpm 3) Driver depth 2 1/2" (55mm)