Diamond Conical Countersink Drill Bit series of tapered grinding heads are forged from high-quality 45-gauge steel. The surface is made of high-strength synthetic diamonds, which are wear-resistant and highly efficient. This product is suitable for boring high hardness metals, such as hard alloys, quenching or nitriding tools, alloy steel knives, mold deburring, shaping, chamfering, polishing, and fixtures.