Irwin Step Drill Bit, Size: 10-1/2" standard, Number of holes: 1

Irwin Step Drill Bit, Type: #13 UNIBIT Step Drill, Size: 1-1/8", Number of holes: 1

Irwin Step Drill Bit, Size: 11-7/8", Number of holes: 1

Irwin Step Drill Bit, Type: 1T 13 Hole Sizes (1/8"-1/2 ), Size: 1/32" Increments

DeWalt Step Drill Bit, 7/8", 1-1/8" Step Drill Bit (2 Hole Sizes)

Irwin Step Drill Bit, Type: 3T 9 Hole Sizes (1/4"-3/4" ), Size: 1/16" Increments