A 15-3/4" long and 2-3/4" wide longboard hand sanding block, which conforms to the standard width of longboard file sandpaper. The flexible hand sanding file board is adjustable for any concave or convex shapes. Users can set their desired angle shape, and the sanding block will maintain that angled shape throughout the sanding process, ensuring consistent contour profiles. The block's hook and loop base features holes to facilitate dust-free sanding. The handle provides a flexible and ergonomic grip, allowing for even control when sanding flat surfaces, tight corners, contours, and other hard-to-reach areas. The low profile and durable construction of the block provides excellent control over the sanding process. Adjustable Contouring Capability: Easily set and maintain your desired angle, allowing the sanding file block to conform to concave or convex surfaces for consistent, accurate contouring. Compatible with Standard Longboard Sandpaper: The 15-3/4" x 2-3/4" dimensions perfectly match standard longboard file sandpaper, ensuring straightforward paper application and replacement. Hook & Loop Backing & PSA Friendly: Equipped with a hook and loop base plus support for Pressure Sensitive Adhesive (PSA) rolls, this sanding block streamlines paper changes and enhances productivity. Dust-Free Sanding Ready: Strategically placed holes facilitate effective dust extraction, improving visibility and helping maintain a cleaner work surface. Ergonomic & Durable Design: The low-profile block offers excellent grip and control, enabling comfortable sanding on flat surfaces, tight corners, contours, and hard-to-reach areas while withstanding regular, demanding use.