Step Drills

Evolution premium step drills are made from the same high quality material as Cyclone Premium Annular Cutters. Tempered tough at 68 Rc means more holes cut per sharpen. The twin flute designallows for a smoother cutting action with no pre-drilling necessary. Evolution Premium Step Drills have 3 chucking flats on the driving shank to ensure no slipping on the Jacobs Chuck. Each hole size is laser etched for clarity. Evolution drills are the best value step drills on the market today. Evolution Premium Step Drills are used with portable hand drills to produce a choice of several hole sizes in steel up to 1/8' thick using only one drill bit.

Sizes Include:

SD-6: Creates 6 Hole Sizes from 3/16' - 1/2'

Two Flutes, 1/4' Shank

Diameters: 3/16', 1/4', 5/16', 3/8', 7/16', 1/2'
,

SD-9: Creates 9 Hole Sizes from 1/4' - 3/4'

Two Flutes, 3/8' Shank

Diameters: 1/4', 5/16', 3/8', 7/16', 1/2', 9/16', 5/8', 11/16', 3/4'

SD-10: Creates 10 Hole Sizes from 1/4' - 1'

Two Flutes, 3/8' Shank

Diameters: 1/4', 13/32', 9/16', 5/8', 11/16', 3/4', 13/16', 7/8', 15/15', 1'

SD-11: Creates 11 Hole Sizes from 1/4' - 1-3/8'

Two Flutes, 3/8' Shank

Diameters: 1/4', 25/64', 35/64', 11/16', 13/16', 7/8', 1', 1-1/8', 1-7/32', 1-1/4', 1-3/8'

SD-12: Creates 12 Hole Sizes from 3/16' - 7/8'

Two Flutes, 3/8' Shank

Diameters: 3/16', 1/4', 5/16', 3/8', 7/16', 1/2', 9/16', 5/8', 11/16', 3/4', 13/16', 7/8'