This is a perfect sanding accessory that looks and feels like a sand machine from the crown sand blocks. Sand blocks are like sand blocks. They can be convenient, putting sandpaper on a wooden block can be a challenge and will always work .Comfortable grip: Made of light and medium-hard nylon foam, you can apply pressure to the wood surface being hout fatigue; the top of the pad includes 3 finger grooves to increase grip and even controlReplace the outer diameter: the size of the base just fits any 5-inch sanding disc, easy to replace the disc; now you do not need to use a separate sanding medium for manual sanding and sandingInstructions for using your 5-inch rail: The base is securely attached to any 5-inch (12.7 cm) hook and loop sanding disc, so you can use the orbital desert abrasive disc, or even discs h abraded edges, which cannot be used for electric sand machinesAny surface: hand-sanded mouse block, 12.70 cm-medium-hard nylon foam hook and ring-shaped sand pad are suitable for abrasive orbital sand discs. The slightly inclined sides can be sanded into grooves, flat or narrow points on curved surfacesColour:yellowMaterial:ABSSize: 12.7x8cmPackage Contents:2x mouse type grinding blockOnly the above package content, other products are not included.Note: Light and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.