This Insulator Kit with Hardware is a practical solution for those in need of insulating their machinery. Made of Polyurethane, this kit includes (4) MA36000, (4) MA37000, (4) 7/8"-9UNC 4" Bolts, (12) 7/8"-14UNF 6" Bolts, (12) Locknuts, and (16) Flat Washers. It fits OE Parts: Gaff 12036 and Mack. This kit is sold by the kit and is a great way to insulate your machinery without breaking the bank.