Materials: Abrasives: aluminium oxide or zirconium oxide Bond:resin over resin Colth: X-weight Application: Polishing for irregular surface of metal,non-metal,and small workpiece. Especially suitable for grinding and fine polishing of metal surface,deep hole. 粒度Grits:36-40-60-80-100-120-150-180-220-240-280-320-400 尺寸Size:直径Diameter 20mm~300mm,厚度 Thickness 15mm~100mm