1Adjustable Curvature: This adjustable longboard sanding block can be set and fixed to flat, concave, or convex surfaces, maintaining the angle shape throughout the sanding process for quick completion of sanding work. 2Reliable and Durable: Made of premium ABS base and nylon hook and loop backing and steel (internal material of the adjustment handle), this sanding board lasting a life time with sandpaper replacement when needed. 3Perfect Hook Loop Design: The manual sanding block features a hook backing design, working excellently with standard sandpaper to quickly and safely connect and remove sandpaper. 4Multi Purpose Application: Hand sanding file block is suitable for sanding, polishing, rust removal, paint stripping, and other projects in home, auto, woodworking, metalworking, and craft industries. Enjoy quick and efficient sanding with this longboard sanding block. 5Easy Carrying: The adjustable manual longboard sanding block is light in weight, easy to carry, and easy to store in a bag for convenient use. 1 xHandSandingFileBlock