Cobalt Drill Bit Set 25pce 1-13mmOverviewUltra-hard 5% cobalt steel. Use on alloy and hardened steel, cast iron, titanium and stainless steel. Always use cooling agent. Sizes: 1-13mm in 0.5mm increments. Loops 25 Piece 1mm 13mm Cobalt Drill Bit Set Cut Steel Iron Titanium Stainless Steel in Metallics