... quality materials,vitrified bond,resin bond and rubber bond. grinding wheel,Centerless Grinding Wheels are stable hardness,even structure and excellent ... (Brown Aluminum Oxide ),WA (White Aluminum Oxide ), C ( Black Silicon Carbide ),GC ( Green Silicon Carbide ) Grit Size:36# ,46#,60#,80#,100#,120#... Bond ... 304.8mm 600 x 250 x 304.8mm ...... Centerless Grinding Wheel