ARP 2002408 Carburetor Stud Kit, Chrome Moly Steel With Black Oxide Finish, 4 Pack, For Select Moroso Applications With 1-1/4" Spacer Make certain that the carburetor stays perfectly sealed to the intake manifold Manufactured from 8740 chrome moly steel with a black oxide finish J-form threads resist loosening from vibration Size 5/16 studs have an overall length of 3.200, and come 4 to a package Kit comes complete with hex nuts and washers