DESK GROMMET SET 8 black desk grommets, desk hole cover for cables 2 inch (50 mm) diameter, 2.51 inch (64 mm) overall diameter, 0.59 inch (15 mm) height, 0.82 inch (21 mm) through-hole diameter. The desk hole grommet outer cord cover is made of durable abs engineering grade plastic, sturdy and non-deformable, durable and reusable. Desk grommet outer surface is threaded and will not loosen after installation.