Effective Step Size
1/8"-1/2" (13 step size) : 1/8",5/32", 3/16", 7/32", 1/4", 9/32", 5/16", 11/32", 3/8", 13/32", 7/16",15/32",1/2"
1/4"-3/4" (9 step size) : 1/4", 5/16", 3/8",7/16", 1/2", 9/16", 5/8", 11/16", 3/4"
3/16"-7/8" (12 step size) : 3/16",1/4", 5/16", 3/8", 7/16", 1/2", 9/16", 5/8", 11/16", 3/4", 13/16", 7/8"
The step drill bit set is compatible with the majority of brands of electric drills or bench drills on the market. It comes with a tool kit, which is easy to store and carry.