3M Scotch-Brite XL-UD deburring disc uses silicon carbide as the abrasive material and has a diameter of 4 1/2 in. Since this product is non-woven, grade is generally used to describe the abrasiveness; with the 27689 having a fine grade. The arbor attachment allows for easy mounting to the tool or pad. All abrasive products that rotate or spin, such as the ones in this category, have a maximum speed at which you can run them. This 3M deburring disc can be run at a maximum speed of 13300 RPMs.