1. Rotary handle + groove design on the back, you can flexibly adjust the size of the curved , flat , concave . 2. Perfect for woodworking polishing, car waxing, wall sanding, rust removal and paint removal, and so on. 3. Set your desired angle shape, and then the longboard hand sanding block hold that angled shape throughout the sanding process, you maintain the same profile while sanding, allowing for dust-free sanding. 4. The hand sanding file block is easy to grip for even control when sanding flat, tight corners, , and other hard-to-reach areas. 5. Can be used sanding or polishing in paint shops, detailing shops, woodworking wood furniture making, metalworking shops, industrial shops, and other household and crafting projects. Adjustable sanding longboards. Colour:Yellow Material:Plastic Size:About 400x120mm Package Contents: 1 x Dry Grinding Hand Push Board 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.