This Drum Sander kit contains four 2" long drums in 1/2", 3/4", 1" and 1 1/2" widths with 1/4" shank and three medium grit sleeves for each size. These drums can be used on all types of surfaces: wood, plastic, rubber, fiberglass, metal, etc. Drums can be mounted in a hand drill, drill press, lathe chuck, flexible shaft or a bench grinder.