1,taper shank drill bit 2,drill bit 3,ground shank drill 4,micro carbide quick bits 5,tungsten carbide drill bits Our Facility: ... machine imported from SwitzerlandSpecification: 1. Super-well micro grain carbide rod: WC=87.5%, Co=12.5%, TRS>4200N/mm2; ... \OEM accepted8,We can also manufacture spherical drilling tool.drill,drilling rig,drill bit,power drill9,Material:Solid carbide steel(tungsten steel ...