Strong and Durable: Use the right material, the sandpaper used in the triangle sander is equipped with a thick paper base, which is made of high quality aluminum oxide and wear-resistant sand.Heavy-duty resin bonding system extends service life Strong and Durable: Use the right material, the sandpaper used in the triangle sander is equipped with a thick paper base, which is made of high quality aluminum oxide and wear-resistant sand.Heavy-duty resin bonding system extends service life 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, air tools, grinders, easy to use The Velcro back makes attachment easy and convenient.Triangular sanding pads are ideal for sanding wood and meet versatile sanding needs on hardwoods such as oak and ponderosa pine or structural panels such as plywood. Do not apply to metal - grind, polish, etc. metal, wood, rubber, leather, plastic, stone, glass and other materials.