The BlueSpot 11 PCE Polishing and Flap Disc Set features a range of aluminium and zirconium abrasives (40, 60, 80 &120 grit) and polishing discs. Ideal for fabrication, de-burring, cleaning, stripping and finishing of wood, metal and plastic. The discs feature a 22.2mm centre and are for use with 4 1/2" angle grinders. The plastic packaging that the product is packed in can be reused as storage for the set.