BC 10MM (.394") 120SC FLEX-HONEThe BC10M12 FLEX-HONE® tool for surface finishing and deburring is designed for bore sizes between 0.375" and 0.394". Featuring 2.00" of abrasive globules which are composed of 120 grit Silicon Carbide (SC). Excellent for Mild steel, stainless steel, cast iron and other softer ferrous materials. 120 grit generally provides an Ra Finish range of 35 - 50 Microinch (.9 - 1.4 Micrometer).