Set Includes: - 240 pieces sanding belts in 3 diameters: 1/2 inch, 3/8 inch and 1/4 inch, 80 feet each per size and 12 pieces sanding drum in 3 diameters: 1/2", 3/8" and 1/4", 4 pieces each size; 252 pieces in total Practical - Standard size and adjustable sanding belts. 120 standard grit, for smoothing surfaces and curved edges and polishing soft and hard materials such as DIY, art and woodwork Easy Installation - Drum mandrels with self-expanding rubber pad, making sanding belts à close to mandrel tightly and achieve a better finish; In case ù the sanding belt comes off the mandrel during use, please make sure the drum has been properly cleaned. screwed and it is very close to the sleeve. Note : Please wear safety glasses, be sure to protect your eyes, because the high speed of the sanding drum may produce lumpy particles. high speed; The sanding roller will be attracted to the metal surface faster, please replace the sleeves in time to achieve the best sanding effect Bonus