Ergonomic, and adjustable flexible long board grinding block can be set and fixed in concave or convex shape. Set the angle shape you want, and then the sanding block will keep the angle shape throughout the sanding process, so you keep the same contour when sanding. There are holes in the appearance of the building blocks and the annular base, which can be polished without dust. High quality 2-3/4 inchwide long board hand grinding block, which is the standard width of long board file sandpaper. You can easily attach the hook-and-loop long file sandpaper to it. The block is easy to grasp and evenly controlled when grinding flat, narrow corners, and other hard-to-reach areas. A multifunctional long board hand grinding block is used for grinding or polishing in automobile body and paint shop, beauty shop, woodworking and furniture manufacturing, metal processing shop, industrial workshop, gypsum board and other household and handicraft projects. Name: length-adjustable grinding plate Colour:white+black Material:nylon Size:70 x 400MM Package Contents: 1 x Polishing plate 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.