Cobalt Step Drill Bits Set

his Cobalt Step Drill Bits Set can drill screw holes while staying put on the same axis. The large bit has a 3-sided shank and the small bits have hex shank to prevent slip in a drill chuck. It is self-starting and does not need a pilot hole, making it extremely convenient to use. It operates automatically as you drill holes through the materials.

Features:                                                              

• Self- starting. No pilot holes needed
• Black chamfer drill body material: steel 45 
• Automatically makes holes as you drill
• Includes protective padded aluminum case
• Cobalt-coated to reduce friction and run cooler

Size: 

• 3/16 "to 1/2" 6 Steps (3/16 '', 1/4 '', 5/16 ", 3/8 '', 7/16 '', 1/2 '')
• 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 '')
• 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 ")
• 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")
• 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")

Package Inclusion:

• 1 x cobalt step drill bit set
• 1 x aluminum case