- Adaptive design: The longboard hand sanding file block features a rotating handle and a rear groove, providing flexibility to adjust flat and curved surfaces. It maintains its angular shape throughout sanding to keep the same profile as you work. - High quality material and comfort: Made of lightweight polyurethane foam, it is durable, elastic, and resistant to breaking. The ergonomic design is easy to hold and comfortable during extended use. Compatible with PSA Sandpaper and PSA Roll Sandpaper. - Excellent performance and compatibility: Lightweight and unique in construction for better control and smooth sanding results, while providing a larger contact area for improved performance. Size: 7 cm x 40 cm (2.76 inches x 15.75 inches). Requires using 70 mm mesh sandpaper or two pieces of 70 x 198 mm sandpaper. - Wide applicability: The back groove can be easily adjusted to concave and convex shapes, yielding the ideal angle for your sanding needs. A versatile tool for a variety of projects, including woodworking polishing, car waxing, wall sanding, rust removal, paint removal, and other DIY tasks. - Use scenarios: Finishing curved edges and surfaces in woodworking polishing; applying smooth, even wax on a car body; preparing walls by sanding, rust removal, or removing paint in DIY projects.