3Pc Step Cone Cutting Drill Titanium Steel Metal Hole Cutter Bit Set 4-32mm - Use tools: pistol drill, bench drill. - The recommended drilling speed is 250-400 rpm. - For home and industry. Temo Step Drill Bit Step Drill Bit 4-20mm Nitride Black 4241 HSS Spiral Taper Cutting Drill Titanium Nitride Coated Step Drill Triangle Shank Solid Carbide Step Drill Bit at ₹ 126/piece in Bengaluru | ID: 24137442812 Made of 4241 high speed steel, suitable for hardness 25° or less workpiece material, such as carbon plate, sheet iron, steel plate. Feature:- By giving you the right depth to guess from the hole. 3pcs HSS Step Drill Bit Set High Speed Steel Step Cone Drill Bits Hole Cutter 4 12mm/4 20mm/4 32 mm Hex Shank Metric Double Slot Cone Cutting Drill for Wood Sheet Metal PVC Thin Metals Sizes are laser etched into the metal so they will not wear out even after repeated use, make precise drilling easy.