Specifications:Material: 6061 T6 billet aluminumSize: AN8 (3/4x16 UNF) male flare to 7/8"x20 carburetor fuel feed inlet fitting. (No instructions included). These fittings enable you to attach -8AN fuel lines directly to standard Holley dual feed and Rochester Quadrajet fuel bowls using 7/8" x 20 ports.