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″. 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″.