Norton Speedgrip Disc 178mm x NH P80 Grit - 5 Pack is a Hook & Loop / Velcro back paper disc for general purpose sanding of wood and metal. This 178mm (7") disc has an aluminium oxide grain to give a fast cut, with an aggressive profile that keeps its shape even when used on curves. The hook and loop backing helps prevent the disc from flying off the sander during use. It's ideal for shaping and finishing at the beginning of a project or restoration job! This disc has a hook and loop backing which allows it to adhere directly onto your orbital sander machine.