... Polycrystalline DiamondType: Imperial, Metric, Non-standardProduct Description:PCD twist drill bits provide good resistance to abrasive wear, it will reduce rubs ... and get good surface finish.Polycrystalline diamond twist drill bits choose tungsten carbide as shank material, this material will ... , plywood, wood product and so on, it will be long service life, no need to change the drill bits in a ...