Package includes - comes with 360 pieces sanding bands and 24 pieces sanding drum mandrel, totally 384 pieces drum sanders set Essential 6 grit accessory - These rotary sanding brands contain 6 sanding grits (80 grit, 120 grit, 240 grit, 320 grit, 400 grit, 600 grit) and 3 diameters (1/2", 3/8" and 1/4") Each grit and size has 20 bands sanding drums for your use Universal Drum Mandrels - 24 pcs shank reusable sanding drums are divided into 3 diameters (1/2", 3/8" and 1/4"), each of 8 pieces Easy installation - make sure the drum has been screwed tightly, the drum mandrels with self-expanding rubber cushion, which makes the sanding bands close to the manderl firmly and obtaining a better finish; Note: Please wear professional safety goggles to protect your eyes, because there may be some grit flying when the sanding drum rotates at high speed Wide compatibility - drum sander set most common standard and common size for smoothing curved surfaces and edges, polishing soft and hard materials, such as home improvement, artwork, woodwork and other finishing work Specifications Sanding belt size: 1/2 inch, 3/8 inch and 1/4 inch Drum Chucks Size: 1/2 inch, 3/8 inch and 1/4 inch Sanding belt material: aluminum oxide Color as shown Delivered quantity: 384pcs/set