SKU-100ED's Auto Flat Routing Drill set Titanium Coated HSS. 6 Bits, measure: • 3mm • 4mm • 5mm • 6mm • 6.5mm • 8mm Features: • Use these titanium-coated high speed steel drill bits to drill and cut through various materials such as wood, aluminium, plastic, brass and sheet metal. • The tip of each drill bit is designed to bore a starting hole and the milled shaft has specially designed teeth (like a saw) to cut through the material