For 1995-2008 3606E & C15,C16,C18 Cat Engines OptiTorque performance head stud kit for Caterpillar C15 and 3406E engines. Made from Patriot 8740 alloy steel with 180–220 KSI tensile strength for maximum clamping force in high-horsepower and heavy-duty applications. Benefits of using heads studs on your CAT rebuild is unlike Head Bolts they are reusable, if you ever need to replace the head or head gasket in the future, you will be able to use the same studs, as they don't stretch like bolts. Also will allow you to safely put more Horsepower without the worry of blowing a head gasket as the stronger clamping force of the studs, bolds tight under high pressures. Kit includes: .table-container { width: 80%; margin: 0 auto; overflow-x: auto; } table { border-collapse: separate; border-spacing: 0; width: 80%; min-width: 600px; font-family: 'Segoe UI', Arial, sans-serif; border-radius: 12px; overflow: hidden; box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1); table-layout: fixed; } th, td { padding: 14px 18px; text-align: left; } th { background-color: #f28b82; color: #333; font-weight: 600; } td { border-top: 1px solid #e0e0e0; } th:nth-child(1), td:nth-child(1) { width: 75%; } th:nth-child(2), td:nth-child(2) { width: 25%; } tr:nth-child(even) { background-color: #fafafa; } tr:hover { background-color: #f5f5f5; } tbody tr:last-child td:first-child { border-bottom-left-radius: 12px; } tbody tr:last-child td:last-child { border-bottom-right-radius: 12px; } @media (max-width: 600px) { .table-container { width: 95%; } th, td { padding: 10px 12px; font-size: 14px; } } Description Quantity LONG HEAD STUDS 10 SHORT HEAD STUDS 16 PARALLEL GROUND WASHERS ( .180" THICK) 26 12-POINT HD FLANGE NUTS 26 ASSEMBLY LUBRICANT 1