18ga. (.048) Heavy Duty Trash Grommet will fit into 5” hole. Flange outside diameter is 5 7/8”. Countertop stainless steel grommet, Trash Chute diameters 15” 12” 10” 9” 8” 7” 6” 5” 4” 3” 2”. Custom rectangular, square & round grommets are available.