High Quality 5PCS HSS Multiple Hole Inch Size Step Drill Bit Set with Aluminium Case

Drill Shank Diameter 1 / 4-1-3 / 8 9mm 3 / 16-7 / 8 9mm 1 / 4-3 / 4 9mm 1 / 8-1 / 2 6mm 3 / 16-1 / 2 6mm

Application: thin steel, metal sheet, PVC board and wood etc.
Sizes: # 1: 3/16 “to 1/2″ 6 Steps (3/16 ”, 1/4 ”, 5/16 “, 3/8 ”, 7/16 ”, 1/2 ”) # 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′, 7/16 ”, 15/32 “, 1/2 ”) # 3: 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 “) # 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”) # 5: 3/16 “to 7/8″ 12 Steps (1/4 ”, 5/16 “, 3/8”, 7/16 “, 1/2”, 9/16 “, 5/8” , 11/16 “, 3/4”, 13/16 “, 7/8”)