The ARP 400-7533 Stainless Steel 12-Point Valve Cover Bolt Kit is designed to securely fasten the valve covers on 2004.5–2016 6.6L Duramax engines (LLY, LBZ, LMM, LML). Built from stainless steel and featuring a 12-point head design, these bolts provide consistent clamping, improved corrosion resistance, and a clean finished look, making them a solid upgrade over factory hardware for engine service, rebuilds, and performance applications.