Benchmark is a set of sanding disks that are designed for angle grinders. They have a diameter of 4.5 inches and are designed for a 7/8-inch seating hole. These discs are designed to work on soft metals, including aluminum. However, they can also be used for steel as well. They are not only suitable for grinding, but also for removing surface imperfections, finishing, and stripping. Each disk has a special coating that prevents clogging of its surface. The disk consists of peculiar petals inclined at an angle of 5 to 15 degrees, which is ideal for working with a flat surface, as well as processing at an angle. The grain size of the abrasive is 36 grid.