Smart Design: 5 holes on the sandpaper can collect dust more efficiently, help keep the work surface clean, and the hook-and-loop sandpaper backing can help you change the paper easily and quickly. Strong & Sustainable: Use the right material, the sandpaper used in the triangle sander has a thick paper base, which is made of high quality alumina and wear resistant sand. Heavy-duty resin bonding system extends life. Triangular Mouse Design: Helps reach tight corners for effective material removal, suitable for Dewalt, Bosch, Black + Decker, Makita. Wide Range of Applications: Suitable for grinding and polishing metal, non-metal, wood, rubber, leather, plastic, stone, glass and other materials, suitable for various power tools, pneumatic tools, grinders, easy use. Packaging: 100 pieces per box, 40/60/80/100/120, Multi-sheet sander classification various grit can meet any polishing requirement, single piece size 5.33 "x 3.35" (140mm x 90 mm).