Package includes - 120 pieces of sanders 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; 132 pieces totalMust-have accessory - Standard and standard size 120 grit sanding belts used for smoothing surface and curved edges, polishing soft and hard materials, such as DIY, artwork and woodworkEasy installation - mandrels of drum with self-expanding rubber cushion, making the sanding bands close to the chuck firmly and getting a better finish; In the event that the sanding band becomes loose from the chuck during use, please ensure that the drum has been screwed on tightly 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 rotates at high speed; the sanding drum will be drawn 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 retrieval sanding bands: 1/2 inch, 3/8 inch and 1/4 inch Sanding material: aluminum oxide Drum chuck sizes: 1/2 inch, 3/8 inch and 1/4 inch with 1/8 shank inchPackage includes1/2" x 40 sanding bands 3/8" x 40 sanding bands 1/4" x 40 sanding bands 1/2" x 4 drum mandrels 3/8" x 4 drum mandrels 1/4" x 4Free plastic box x 1NoteWear professional goggles to protect your eyes, because there may be dust specks when the sanding drum rotates at high speed. The sanding drum will be attracted faster on the metal surface, please replace the sleeves es in a timely manner in order to achieve the best sanding effect. These products are not edible and please keep them away from babies under 3 years old.