World-Class Spiral Variable Multi Step Down Drill Bit Unibit Tool Uni Stepped Colbalt Set Original

Cobalt steel bits provide longer life and cut faster than high speed steel

Two spiral flutes, automatically will de-burr the edge as you drill and provides better chip removal

Tri-flat shank for sure grip

135 degree split point, self centering

Case included

Set Contains:

1/4" shank:

3/16" to 1/2"

6 steps (3/16", 1/4", 5/16", 3/8". 7/16", 1/2")

1/8" to 1/2"

13 steps (1/8", 5/32", 3/16", 7/32", 1/4", 9/32", 5/16", 11/32", 3/8", 13/32", 3/8", 13/32", 7/16", 15/32", 1/2")

3/8" shank:

1/4" to 3/4"

9 steps (1/4", 5/16", 3/8", 7/16", 1/2", 9/16", 5/8", 11/16", 3/4")

1/4" to 1-3/8"

10 steps (1/4", 3/8", 1/2", 5/8", 3/4", 7/8", 1", 1-1/8", 1-1/4", 1-3/8")

3/16" to 7/8"

12 steps (3/16", 1/4", 5/16", 3/8", 7/16", 1/2", 9/16", 5/8", 11/16", 3/4", 13/16", 7/8")