Product: Tungsten Carbide Drill Bits for PCBMaterial: Tungsten CarbideType: Imperial,Website:http://www.chinabettool.com, Metric, Non-standardProduct Description:Tungsten carbide drill bits for PCB are high precision and high quality, the micro PCB carbide drill bits size is 0.3~1.2mm.It has enough space for chips discharge, it will be little resistance and smooth.High quality materials will cause to good workpiece edge, our product will reduce cutting problem, less edge crack of the drill edge, improve the hole precision.Service life is longer, if it is under normal working situation, you can grind the PCB drill bits 4~5 times.