Sanding sheet Brown corundum, silicon carbide, paper base, sand surface coated with zinc stearate super coating, with anti-static and anti-blocking effects. Mainly used for: surface treatment of furniture, woodware, handicrafts, etc., as well as manual polishing of metals, automobiles, hardware, marble, etc. Standard size: 230mm X 280mm (9”X11”)Flap wheel Aluminium oxide, pure cotton cloth, a round coated abrasive made by professional processing. Mainly used in: It can be installed on various automatic, electric and manual grinding machines to perform grinding and polishing operations on various irregular surfaces. Shape: Shank Mounted, Tread Mounted, Arbor Holes, Interleaved. Diameter: 10mm-400mmFlap disc Zirconium corundum, Brown corundum, Silicon carbide, Calcined corundum, pure cotton cloth, can polish concave curved surface, high wear resistance. Mainly used in: grinding of stainless steel, titanium alloy steel, casting mouth and welding spot. Type: Flat, Tapered, Convex Diameter: 50mm(2”)-180mm(7”) Backing Plate: Fiberglass, Plastic, other Fastening Type: Arbor Hole, Threaded Hub, otherSanding Discs Type：Fiber Disc, Paper Disc, Cloth Disc Diameter: 25mm(1”)-235mm(9”-1/8”) Fastening Type: None, Hook & Loop, PSA/Adhesive, Quick Change, Arbor Hole, Other. Vacuum Holes: None, Round Hole, 5 Holes, 6 Holes, 8 Holes, 16 Holes, Other.