EASY INSTALLATION:Drum Mandrels With Self-Expanding Rubber Cushion,Making The Sanding Bands Close To The Firmly And Acheiving Better Finishing In Case The Sanding Band Fall Apart From The Mandrel While Using,Please Make Sure The Drum Have Been Screwed Tightly And Wear Closely To The Sleeve PRECISION TIGHT,NON-SLIP FIT:embrace the sanding bands with a snug fit,keeping the sandpaper sleeves in place,for extra fine artworkREUSABLE:Our Drum Mandrels Were Produced With Heavy Duty Rubber For a Long Lasting Endurance. sanding rings can be used for smoothing surface and curved edges,polishing both soft and hard materials,like home improvement,artwork and wood works. High-quality materials can perfectly assist you in the engraving,wood carving,metal,plastic,jade,circuit board DIY and other grinding.It is a must-have item for homes,factories,and etc. colour:Brown + black Material:Alumina + rubber Size:Drum mandrel (2.35mm / 3.17mm) Package Contents: 300* belt sleeve (80#/ 120#/ 240#) 6* drum type mandrel (2.35mm / 3.17mm) 1* combination wrench Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.