Introducing the 3 in. x 21 in. 80 Grit Aluminum Oxide Sanding Belt by POWERTEC.✔This premium pack of 40 was designed to provide you with a cost effective set of long lasting and high performance sanding belts. Made with open coat Aluminum Oxide (A/O) grain, they act as a multi-purpose tool best used for wood sanding, shaping, stripping and giving a smooth finish to many of your woodworking applications. Additionally, these belts work exceptionally well with lite and non-ferrous metals, blending welds, fiberglass, plastic, and rubber.✔Each belt flaunts an X-weight clothed backing, and possesses a strong resin on resin bond with well crafted seams for long lasting results. Whether you're a professional or DIY kind of guy, these heavy duty sanding belts are compatible with many of your go-to sanders, including:✔Craftsman, Makita, Skil, Wen, Ridgid, Porter-Cable, Black+Decker,Bosch, Triton, Hitachi, Metabo, and more!【Specifications】 : Abrasive Belt Size: 3-in. x 21-in.Grit Size: 5 Each of 40/ 80/ 120/ 240【Material】: Premium Open Coat Aluminum Oxide (A/O) Grain Backing: Strong in.X in. Weight Cloth【Backing Joint】: Strong Butt Joint Construction【Package】: 40 pieces Grit Selection Guide:✔40 - 60 Grit: Heavy Sanding and Stripping✔80 - 180 Grit: Removing Tiny Imperfections✔240 - 400 Grit: Delivering a Super Fine Smooth Finish.