Aggressive tooth geometry for up to ten times faster cutting than hole saws. Deep gullets for easy plug removal. Three hardened steel teeth provide maximum durability against unintended nail impacts. Cuts up to 600 holes in wood without needing to be re-sharpened. Storage space for additional hole cutters. Includes; (6) hole cutters: 2-1/8", 2-1/4", 2-9/16", 3", 3-5/8", 4-1/4". (1) arbor with pilot bit. (2) pilot bits. (1) diamond file. (1) hex wrench and impact resistant case.