
Made of high hardness HSS 4241 and with tough titanium coating, the drill bits are solid and durable Shank: 6mm, 8mm, 10mm, 12mm; Size: 2-5mm, 5-10mm, 10-15mm, 15-20mm Perfectly drill into materials with hardness below 28 degrees, such as plastic, wood, soft metals, etc. These drill bits can be used to chamfer the workpiece opening and the hole in conical shape Ideal for professional or amateur DIY and repair