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. The Taylor Made E-Z Grommet Punch set is made in the USA. The grommet innter diamter is 3/8" and the tool dimensions are 1-1/2" L x 3/8" D. Be kind to your boat and keep those holes strong on your cover or tarp. Taylor Made is a proud member of the Lippert family, a global manufacturer and supplier of engineered products for the RV, marine, automotive, commercial vehicle, and building products industries. At Lippert, our commitment to our customers is always moving forward, always making your experience better. Choose Taylor Made®.