Package includes - comes with 360 pieces sanding belts and 24 pieces sanding drum mandrel, total 384 pieces drum sander set 6 Grit Essential Accessory - These rotary sanding marks 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 at 20 sanding bands for your use Universal Drum Mandrels - 24 pcs reusable shank sanding drums are divided into 3 diameters (1/2", 3/8" and 1/4"), each of 8 pieces Easy installation - prove yourself the drum screwed down, the drum chucks with a self-expanding rubber cushion, making the sanding bands close to the downside mandrel and getting a better finish; Note: Please wear professional goggles to protect your eyes, because there may be some grit flying when the sanding drum rotates at high speed Wide compatibility - set of sanding drum sanders most approved standard and common size for smoothing surfaces and curved edges, polishing soft and hard materials, such as home improvement, artwork, woodwork and other finishing work > Specifications Abrasive Belt Size: 1/2 inch, 3/8 inch and 1/4 inch Drum Core Size: 1/2 inch, 3/8 inch and 1/4 inch Sanding belt material: aluminum oxide Color as shown Quantity shipped: 384pcs/set