Sanding drums uses aluminum oxide as the material to grind, depilate, level, fine grind and polish the workpieces with metal planes, curved surfaces and special angles. Different sand grain sizes can meet your different needs. Sanding drum kit includes: 120 pieces 120 grit sanding bands in 3 diameters(1/2 inch, 3/8 inch and 1/4 inch) and 12 pieces shank sanding drum in 3 diameters(1/2 inch, 3/8 inch and 1/4 inch). This sanding drums kit is suitable for allrotary tools.Please wear professional safety glasses during use to prevent flying sand from entering your eyes when the belt rotates at high speed. Installation method: Push the sanding drums into the drum mandrels, and then tighten the screws of the sanding drum to make the abrasive belt closely adhere to the mandrel (please that the drum is tightened, otherwise the sanding band fall apart from the mandrel when using). Sanding drums are used to polish soft and hard materials, wood products and other decorations, as well as smooth surfaces and curved edges, such as home decoration and artworks. This product is consumable, please replace the sleeve in time when using it to achieve better sanding effect. Colour:As Shown Material:sandpaper Package Contents: 132 * Sanding Drum Set Only the above package content, other products are not included. Note: Light reflection 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.