The product is a set of 15 4.5 inch flap discs designed for grinding tasks. These sanding discs are compatible with angle grinders and made of aluminum oxide grit material, providing durability and effective sanding performance. With an arbor hole diameter of 0.88 inches and a product dimensions of 4.5" l x 4.5" w, these assorted sanding discs are ideal for various grinding applications in the workshop. Made in China, these high-quality flap discs offer a reliable and efficient solution for sanding and grinding projects.