It is the special grinder for ball end mill. Grinding is accurate and rapid, easy operation, with no skill requirement to grind. With Taiwan diamond grinding wheel, only one piece can complete all procedure. It can be equipped directly with an accurate angle and long service life. Standard equipment:X8# eight collets; Standard grinding range Φ6-Φ20. Standard Collet Model No : X8 (8 Pes) : 6,8,10,12,14,16,18,20 Grinding Wheel: CBN Wheel For HSS Drill Bit / SD Wheel for Carbide Drill Bit Â