Replace or add garments yourself to tents, sails, awnings, pool covers, tarps and canapies. A grommet comprises of two pieces, the grommet and the washer, when these two pieces are forced together, with material in the middle, you end up with a durable hole. Kit contains (24) 3/8" grommet washers, (24) 3/8" grommets, 3/8" hole punch, flaring tool, base and block.