Moroso 39050 Moroso Firewall Grommets - 25 PackMoroso 39050 Moroso Firewall Grommets 25 Pack Firewall Grommets Black, thermoplastic grommets will fit five different size holes for wires and cables passing through the firewall They not only insulate, but provide mechanical protection against chafing Outside dimensions range from 1 2" to 1", the inside from . 41" to . 89" Package of 25; five of each size