Package Contents: 144pcs Sanding Belts and 6pcs Drum Mandrels. A total of 150pcs Drum Grinders with a free plastic box, convenient to store and grab 【Perfect Combination】Rotary sanding belts include 2 sanding grits (80 grit, 120 grit) and 3 diameters (1/2", 3/8" and 1/4"), each grit and size has 24pcs sanding belts Universal Mandrel: 6pcs reusable drum mandrels divided into 3 diameters (1/2", 3/8" and 1/4"), 2pcs of each size. Common and standard size compatible with all rotary tools such as Dremel 【Easy Installation】Different sizes of rubber sanding rollers serve as different diameter sanding sleeves, which is convenient for installation and use. Note: Please wear professional goggles to protect your eyes, because there may be flying grains when the sanding drum rotates at high speed 【Excellent Compatibility】Standard size drum sander kit, widely used for smoothing curved surfaces and edges, both for soft and hard materials such as DIY, woodworking, crafts and other DIY finishing