Silverline Titanium Coated HSS Step Drill Set 3pce 3pce, Quick change hex shank

Amazon

Self-starting step drill with storage wallet For precision drilling of sheet metals, alloys and plastics up to 4 mm thick Clearly marked 2 mm graduations Quick change 6.35 mm (1/4") hex shank Sizes: 1/8"-1/2", 3/16"-1/2" and 1/4"-3/4", Weight: 0.330693393 pounds, Manufacturer: SLTL4

Electrical World

Self-starting step drill with storage wallet for precision drilling of sheet metals, alloys and plastics up to 4mm thick. Clearly-marked 2mm graduations. Quick-change 6.35mm (1/4") hex shank. Includes sizes 1/8"-1/2", 3/16"-1/2" and 1/4"-3/4".