Evolution SD-11: 1/4 to 1-3/8 in. Straight Flute Step Drill

SD-11: (11 Hole Sizes) Two Flutes 3/8″ Shank
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″

Evolution Premium Step Drills are made from the same high-quality M2AL as Cyclone Premium Annular Cutters. These tools are heat treated to 68RC, giving them more durability during tough applications.

Evolution Premium Step Drills are used to produce a range of hole sizes in steel up to 1/8″ thick using only one tool. The twin flute design allows 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 in the chuck.

Diameters

SD-6: (6 Hole Sizes) Two Flutes 1/4″ Shank
3/16″, 1/4″, 5/16″, 3/8″, 7/16″, 1/2″

SD-9: (9 Hole Sizes) Two Flutes 3/8″ Shank
1/4″, 5/16″, 3/8″, 7/16″, 1/2″, 9/16″, 5/8″, 11/16″, 3/4″

SD-10: (10 Hole Sizes) Two Flutes 3/8″ Shank 
1/4″, 13/32″, 9/16″, 5/8″, 11/16″, 3/4″, 13/16″, 7/8″, 15/16″, 1″

SD-11: (11 Hole Sizes) Two Flutes 3/8″ Shank
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: (12 Hole Sizes) Two Flutes 3/8″ Shank
3/16″, 1/4″, 5/16″, 3/8″, 7/16″, 1/2″, 9/16″, 5/8″, 11/16″, 3/4″, 13/16″, 7/8″