... metallic; grinder Brief: 1. Obtain surface roughness less than Ra0.1 easily; 2.Suitable for different shapes,such as cylindrical,internal,screw ... machine,boring machine,milling machine,planning machine,spherical lathe and CNC machine tools,ect, just only change the cutter; 6.Just ... remove any materials from the surface. JINGTA JTSU30-1 universal cylindrical grinder