Engine Rocker Arm Stud Girdles Aluminum For SB Chevy 3/8 Stud Sold as Pairs ProformStud Girdles reduce flex and part breakage. Increased valvetrain rigidity helps minimize energy loss. Each set comes with aluminum stabilizers and poly locks. Two pieces per set. Sold as a kit Product Details: Engine Rocker Arm Stud Girdles Clamp On Style Made From High Quality Aluminum Fits 1955 to 1995 Small Block Chevy 262 400 Engines Using 3 8 24 Stud Threads Poly Locks Included Purple Anodized Finish Sold As A Kit