Straight Flute Step Drill 3/16 to 1/2, 6 hole size, 1/32 increments 1/4" Shank (SD-6)

Straight Flute Step Drill  1/4 to 3/4, 9 hole size, 1/16 increments, 3/8" shank (SD-9)

Straight Flute Step Drill  1/4 to 1, 10 hole size, 1/16 increments 3/8", Shank (SD-10)

Straight Flute Step Drill  1/4 to 1-3/8, 11 hole size, 1/8 increments, 3/8" Shank (SD-11)

Straight Flute Step Drill 3/16 to 7/8, 12 hole size, 1/16 increments, 3/8" Shank (SD-12)