3M 6″ HOOKIT IMPERIAL SANDPAPER DISCS – This product earns the 3M Purple color which indicates the latest 3M technology, greatest cost / value and highest quality available. 3M Hookit Discs 360L are high-performance discs designed to cut faster and last longer on composite substrates enabling the user to obtain maximum usage from each disc. Designed for use on gelcoat. Disc is 6″ x NH. Product sold by the box of 100 discs.