Features: * Suitable for polishing metal, amber, model, wood carving, root carving, etc. * Diamond wool copper steel abrasive sleeve is more durable and wear-resistant. * Make sure the drum has been screwed firmly, the drum pins with self-expanding rubber cushion, making the sanding belts firmly close to the mandrel and ensure a better finish;* Note: Please wear professional safety glasses to protect your eyes, as there may be flying grits when the sanding drum rotates at high speed* The most common and standard drum sanding set, which is widely used in smoothing surfaces and curved edges, polishing both soft and hard materials, such as DIY, graphics, carpentry and other DIY. Specifications: Product Name: Sanding Drum Kit Material: Sandpaper, Metal Color: As Shown (Silver, Black, Red) Sanding Drum Size: (Approx.) 8*13mm/13*14mm Extension Size: (Approx.) 3*6*40mm / 3*13*38mm Optional type: small set, large set Suitable for: metal surface cleaning, derusting, grinding, dusting, deburring, polishing, residue removal. Quantity: set of 12 pieces Package includes: 10 sanding drum 2 extension Note :1. Transition: 1cm=10mm=0.39 inch.2. The real color of the item may be slightly different from the pictures shown on website caused by many factors such as brightness of your monitor and light brightness.3. Please allow slight manual measurement deviation for the data.