Grit Guidelines 40-240 Grits Coarse grinding series, which is used to grind hard and rough objects such as metal and wood. 240-400 Grits Fine grinding series, which is usually used for secondary grinding. For some objects with low requirements, they can be directly ground into shape. Product Features Easy & Quick to Install Good Stickiness Not Fall of When Installed in Use Triangle Sanding Pads 9 Kinds of Grit Sandpaper Selection We have 9 kinds of grit sandpaper for your choice, which can almost meet your requirements for grinding and polishing of metal and non-metallic materials. Widely Used Triangle shaped sander sandpaper is very convenient for sanding, grind and polishing the area you want to handle, and is specially used with pneumatic, electric or manual sanders. Mouse detail sander sandpaper is is a good helper for dealing with the surface of metal, wood, rubber, plastic, leather, glass, plastic, stone and other materials. Specifications Material: Alumina Oxide Grain Size: 3.15 "x 3.15" x 3.15"/80 x 80 x 80mm Applicable Machine: 3-1/8" Oscillating Multi Tool