General description 307 Pieces Drum Sander Set includes 300 sanding sleeves (80/120/240 grit) and 6 mandrels for rotary tools (2.35mm/3.17mm). This versatile sanding kit is ideal for smoothing and polishing both soft and hard materials, making it perfect for home improvement, artwork, and woodworking projects. The high-quality materials ensure durability and effectiveness in engraving, wood carving, metal, plastic, jade, and circuit board DIY tasks. Technical specifications Color: Brown + Black Material: Alumina + Rubber Drum mandrel sizes: 2.35mm / 3.17mm Package contents: 300 sanding sleeves (80#/120#/240#), 6 drum type mandrels (2.35mm / 3.17mm), 1 combination wrench Measurement allowed error: +/- 1-3cm Installation Drum mandrels feature a self-expanding rubber cushion that ensures a tight fit with the sanding bands. To achieve optimal performance, make sure the drum is screwed tightly and the sanding band is worn closely to the sleeve. Usage The sanding rings can be used for