Description: Premium Material: The hand sanding blocks are made from premium PU, flannel, and short hook cloth material, wear resistant, sturdy, and ensure a long time to use.Sanding Pad Kit: These sanding blocks are designed for corner and contoured sanding, making them a versatile tool for your woodworking needs.Multiple Shapes: The sander blocks come in assorted convex and concave shapes to accommodate different curves and grooves, ensuring a smooth finish every time.Efficient Polishing Tool: This hand sanding block set makes polishing inner curves, curve edges, angles, and step planes easier, more efficient, and consistent.?The sanding chassis adopts the hook and loop design, which is convenient for changing sanding paper.Wide Applications: Versatile sander blocks are suitable for sanding wood furniture, auto paint, moldings, home arts, industrial, drywalling, woodworking and other DIY crafts. Specification: Material: PU, Flannel, Short Hook Cloth Size Chart: 12mm 17mm 18 mm 25mm 28mm 30mm 40mm 50mm 9mm 18mm 26mm 35mm 40mm 40mm 100mm 77mm Package Includes: 16 Hand Sanding Blocks Note: Please allow slightly errors 1-2cm differences due to manual measurement.