This 1/2" Grommet Kit from General Tools has everything you need to make durable repairs to canvas, tarpaulins, tents, awnings, sailcloth, lawn furniture, and pool covers. It contains a hole cutter, hardwood backer block, hardened mandrel, anvil, setting tool, and twelve 1/2 in. grommets. The setting tool features a knurled body for extra comfort and safety.