Grinding machine & tools for sharpen drilling bits Xiamen bestlink factory co., ltd is a manufacturer of hand-held and semi-automatic button bit grinding systems. These systems are designed to restore the profile of tungsten carbide tips on any size and type of button bit, including DTH bits, Threaded, and Raise Bore Cutters. It's systems can be rig mounted, stationary and either hydraulically, pneumatically, or electrically operated. Please see product section for details.