This Pack Of 10 Gold Sanding Discs Are Made From Aluminium Oxide With A Special Treatment Of Calcium Stearate Which Is Resin Bonded To Provide Self-Sharpening And Anti-Clogging Performance. The Heavy Duty D-Weight Backing Paper Makes The Sanding Disc More Durable - Able To Withstand The Toughest Jobs. The Hook And Loop Backing Offers Decent Adhesion To Facilitate The Fast Changing Of Sanding Discs. The 15 Pre-Punched 8Mm Holes Improve The Dust Extraction During Sanding. Ideal For Sanding And Finishing Wood Metals - Including Ferrous Alloys Painted Surfaces Varnish Plastic And Fillers. Compatible With All 150Mm Random Orbit Sanders With A Hook And Loop Backing Pad Including Draper Stock No. 58097 And 89522.PTDDRPDIR08477