Description:1. Easy installation: drum mandrels with self-expanding rubber cushion, so the sanding belts are close tightly and provide a better finish in case the sanding band falls apart from the mandrel during use, make sure the drum has been screwed tightly and wear tightly to the sleeve.2. Precise, non-slip fit: Embrace the sanding belts with a snug fit, keeping the sandpaper sleeves in place for ultra-thin works of art.3. Reusable: Our drum mandrels are manufactured from durable rubber for long-lasting durability.4. Sanding rings can be used to smooth surfaces and curved edges, polish both soft and hard materials such as DIY, artwork, and wood.5. High-quality materials can perfectly help you with engraving, carved in wood, metal, plastic, jade, DIY circuit board and other grinding. It is an indispensable item for homes, factories, etc. Specifications:Item Name:Sanding Drum KitColor: Brown+Black Material: SandpaperSize: Drum Mandrel: 3.17mmNote:-There may be a small size error for manual measurement.-The color deviation may vary due to different monitor settings, please understand.