AES Industries 80 Grit 4" Abrasive Nylon Filament Bristle Surface Prepping Cup Brush COARSE 80 grit embedded nylon brush strands evenly wear down during use, freshly exposing new grit for clean and fast scuffing / prepping with every use. THE "GO TO" abrading brush for quickly and properly prepping old and new surfaces before applying sprayable bed liner. SAFE AND EQUIVALENT, non-sparking alternative to steel wire cup brushes which can react and cause sparks when working on surfaces with a metal base or structure underneath. DESIGNED TO WORK effectively without loading or clogging on multiple surfaces including metal, wood, aluminum, and plastic. This brush can also be used to create a decorative swirl finish on stainless steel, aluminum and sheet metal surfaces. SPECIFICATIONS: 4" diameter brush head, 80 grit abrasive nylon strands, 5/8" - 11 Thread, Maximum RPM 8,500.