3Pcs Steel Titanium Step Drill Bits 3-12/4-12/4-20mm Step Cone Cutting Tools Wood Metal Drilling Set
Titanium nitride coating provides up to 6 times the life over high speed steel. For drilling cylindrical holes in solid material up to a thickness of 4mm. Burr-free and vibration-free drilling. Drilling perfectly round holes in steel, brass, copper, aluminum, wood and plastic, pvc sheet, insulation boards, thin iron, Drills up different sizes holes with one bit.