The Dorman 550-024 1-47/64 Expansion Plug Freeze Plugs are a set of engine block plugs designed for use in vehicles. Made by Dorman/AutoGrade, a trusted brand in automotive parts, these plugs are manufactured with high-quality materials to ensure durability and performance. Specifically designed for engine block expansion, these plugs provide a reliable solution for maintaining proper engine function and preventing freeze plugs from causing damage during cold weather conditions. The quantity of 3 plugs included in this package is ideal for servicing 12 cylinders, making it a convenient and essential addition to any vehicle's engine maintenance plan.