Package includes - 120 pieces sander in 3 diameters: 1/2", 3/8" and 1/4", 40 pieces per size, and 12 pieces sanding drum in 3 diameters: 1/2", 3/8" and 1/4", 4 pieces per size; total 132 pieces Essential Accessory - 120 grit standard and standard size sanding belts used for smoothing the surface and curved edges, polishing soft and hard materials, such as DIY, artwork and woodwork Easy Installation - drum chucks with self-expanding rubber pad, making the sanding belts close to the chuck firmly and getting a better finish; In case the sanding band comes loose from the chuck during use, please make sure the drum has been screwed tight and is very close to the sleeve Note: Please wear professional safety goggles to protect your eyes, because there may be lump particles when the sanding drum is rotating at high speed; the sanding drum will be attracted to the metal surface faster, please replace the sleeves timely in order to get the best sanding effectBonus - come with a free plastic box, convenient for store and retrievalSpecificationsSanding bands size: 1/2 inch, 3/8 inch and 1/4 inch 4 inch with 1/8 inch shank Package includes 1/2 inch sanding bands x 40 3/8 inch sanding bands x 40 1/4 inch sanding bands x 40 1/2 inch drum mandrels x 4 3/8 inch drum mandrels x 4 1/4 inch drum mandrels x 4 Free plastic box x 1 Note professional protective gear to protect your eyes, because there may be dust specks when the sanding drum rotates at high speed. The sanding drum will be attracted to the metal surface faster, please replace the sleeves timely in order to achieve the best sanding effect. These products are inedible and keep away from babies under 3 years old.