Set includes: 240 pieces sanding belts in 3 diameters: 1/2", 3/8" and 1/4", 80 pieces per size and 12 pieces sanding drum in 3 diameters: 1/2", 3 /8" and 1/4", 4 pieces per size; 252 pieces in total Practical - Standard size and standard 120 grit sanding belts, for smoothing the surface and curved edges and polishing soft and hard materials, such as DIY, arts and crafts and woodworking < p>Easy installation - Drum mandrels with self-expanding rubber cushion, which makes the sanding belts fit tightly on the mandrel and achieves a better finish; If the sanding belt comes off the mandrel during use, please make sure the drum is screwed in tightly and is very close to the sleeve. Note: Please wear professional safety glasses to protect your eyes. because there may be lumpy particles when the sanding drum rotates at high speed; the sanding drum will be attracted to the metal surface faster. Please replace the sleeves in time to achieve the best sanding effect. Bonus - Comes with a free