Brand: ATI Performance Products Manufacturer's Part Number: ATI951650A Part Type: Engine Expansion Plugs Product Line: ATI Block Plugs Automotive Fittings Part Number: ATI-951650A UPC: 800157079993 Expansion Plug Material: Aluminum Quantity: Sold individually. Notes: For use on the water jacket holes. Description: ATI now offers PTFE anodized, 6061 billet aluminum water jacket and oil galley plugs. Trying to shed some weight off the nose of your race car? Don't put heavy, rusty, steel plugs in your new or freshly overhauled steel block; you can save almost 2 lbs. and look good while doing it with ATI block plugs!