Description Abracs Zirconium Sanding Belts 20mmx520mm are continuous cloth belts for heavy duty use.  High quality zirconium grit.  Extra heavy-duty Y-weight cloth backing.  Fully-ground belt joints, to prevent the joint ‘catching’ the work-piece during use.  Suitable for power file belt sanders. Zirconium File Sanding Belts – Features and Highlights Grit: 60g / Grade: Coarse Size: 20mm x 520mm Zirconium Powerfile Belts Full Resin Bond Heavy Duty Y-Weight Cloth Backing For Wood, Metal, Plastics, Plaster & Paint Fits 20 x 520mm Sanders & File Sanders Shrink Wrapped in 10