... :1.0mm-73.5mm Grade:G10-G25 Surface:Mirror face Tungsten carbide ball YG6 is consisted of WC-CO ,WC:94%,CO ... speed.Usage:Bearings,punching,grinding other media and so on Tungsten carbide ball YG6 is consisted of WC-CO ,WC:94%,CO ... . Usage:Bearings,punching,grinding other media and so on YG6 Tungsten carbide ball