Introducing the 3” x 21” 320 Grit Aluminum Oxide Sanding Belt by POWERTEC. This premium pack of 10 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-Inch x 21-InchGrit Size: 320Material: Premium Open Coat Aluminum Oxide (A/O) GrainBacking: Strong “X” Weight Cloth BackingJoint: Strong Butt Joint ConstructionPackage: 10 piecesGrit Selection Guide: 40 – 60 Grit: Heavy Sanding and Stripping 80 – 180 Grit: Removing Tiny Imperfections 240 – 400 Grit: Delivering a Super Fine Smooth Finish POWERTEC is a professional manufacturer of high quality woodworking machines, wood work accessories, and a wide assortment of OEM replacement parts. We are committed to exceeding expectations, while bringing the best innovations, technologies, and product development to the industry.