The General Tools 1/2" Grommet Kit is ideal for repairing canvas, tarpaulins, tents, awnings, sailcloth, lawn furniture and pool covers. Ideal for repairing canvas, tarpaulins, tents, awnings, sailcloth, lawn furniture and pool covers. Contains hole cutter, hardwood backer block, hardened mandrel, anvil, setting tool and twelve 1/2 in. grommets. Setting tool has knurled body for greater comfort and safety.