Our grommet punch set has what you need to install grommets on boat covers or tarps for tying down. Made from a durable brass, the set includes hold punch, setting tool, grommets and washers. Our grommet set is handy to keep the holes in your tarp or boat cover reinforced. You need both to keep your boat protected whether you're trailering your boat, storing or mooring. It has everything you need to keep these holes from widening and fraying including a hole punch, setting tool, 18 #2 brass grommets and washers. Set includes hole punch, setting tool, 18 brass #2 grommets and washers; Grommet inner diameter 3/8"; Durable brass construction; Reinforce holes in boat cover or tarp to prevent fraying or growing; Made in the USA; Tool dimensions 1-1/2" X 3/8" diameter; Installs #2 grommets with a 3/8" hole