Package includes - comes with 360 pieces sanding belts and 24 pieces sanding drum mandrel, totally 384 pieces drum sander set 6 Grit Essential Accessory - These rotary sanding marks contain 6 pieces of sanding grit (80 grit , 120 grit, 240 grit, 320 grit, 400 grit, 600 grit) and 3 diameters (1/2inch, 3/8inch and 1/4inch) ) Each grit and size has 20 sanding bands for your use Universal Drum Mandrels - 24 pcs reusable shank sanding drums are divided into 3 diameters (1/2inch, 3/8inch and 1/4inch), each of 8 pieces Easy installation - ensure make sure the drum was screwed firmly, the drum chucks with self-expanding rubber pad, which makes the sanding bands close to the mandrel firmly and getting a better finish; Note: Please wear professional goggles to protect your eyes, because there may be grit flying when the sanding drum rotates at high speed Wide compatibility - standard and common size drum sander set most popular for smoothing surfaces and curved edges, polishing soft and hard materials, such as home improvement, artwork, woodwork and other finishing work Specifications Size of sanding belts: 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 delivered: 384pcs/set