ThunderBit Cobalt Sets Set 15 Piece Cobalt, HSS Bronze Oxide 1/16"-1/2" by 32nds

Features

• Thunderbit® drills have a special heavy-duty core that guarantess increased strength and reduced breakage. Unique spiral flute design improves chip ejection and coolant flow to the point. M42 Cobalt steel for use in harder, more abrasive materials.