Drum design eliminates the need to buy replacement sanding sleeves. Simply cut and fold any type of sheet sandpaper for the drum size you're using. Drums feature balanced solid cores with sponge rubber backing to ensure long wear of sandpaper. Unique pin locking device is simple and effective. Drums can be attached directly to a 1/2" motor arbor or used in a drill chuck. Use on drill presses, lathes, motors, combination tools, radial saws, and portable drills. Dimensions listed are drum diameter x length x shaft diameter.