4.5” x 4” x 3/4” quad key shaft Surface Conditioning Abrasive Drums by Black Hawk Abrasives are designed to clean, blend, finish and condition metal with ease. Each 4-1/2 inch non-woven drum is manufactured with premium nylon webbing infused with aluminum oxide grains centered around the 3/4” keyed shaft. The porous, non woven structure promotes airflow and resists loading which prolongs the useful life of the wheel and reduces heat buildup which may stain or distort work pieces. The 4” surface finishing drum by BHA offers a greater sanding surface area compared surface conditioning quick change or flap discs making them ideal for large jobs. The 4.5 inch black hawk abrasives non woven surface conditioning flap wheel drum is uniquely suited for light paint and rust removal, creating a satin finish on some metals, as well as final stage conditioning before buffing begins. This drum is affixed with a hub that fits 3/4 inch keyed shaft that attaches to surface finishing machines and linear grinding machines (A.K.A. Burnishers, burnishing machines, contouring grinders, etc.) and is available in 60 grit, 120 grit, 240 grit and 320 grit. 4.5 Inch Diameter x 4 Inch Wide with 3/4 Inch Quad Key Arbor Hole Manufactured with Impregnanted Non-Woven Surface Conditioning Material Great for Removing Light Rust and Paint, Final Prep Before Buffing, or Creating a Satin Finish Heat and Load Resistant Use On: Surface Finishing Machines, Linear Grinding Machines, Burnishers, Burnishing Machines, Contouring Grinders, etc. ASIN B087YQVBQ2 Model DRM4SC Grit Type Very Fine Brand Name BHA Unit Count 1.0 Count Grit Number 320 Part Number DRM4SC Manufacturer BHA Item Diameter 4.5 Inches Material Type Aluminum Oxide Item Thickness 4.5 Inches Item Dimensions 4.5 x 4 x 4.5 inches Construction Type Grinding Compatible Devices Burnishers, Burnishing Machines, Contouring Grinders, Linear Grinding Machines, Surface Finishing Machines Grit Material Type Aluminum Oxide, Nylon Compatible Material Metal Item Dimensions L x W 4.5 L x 4.5 W Maximum Rotational Speed 4000 RPM Industry Standard Identifier 00840134207544 Recommended Uses For Product Grinding, Rust Removal Global Trade Identification Number 00840134207544