ARP premium grade, stainless Header Collector Bolt Kits are used to install standard exhaust headers and collectors with a three bolt flange. The premium grade stainless material of each bolt kit is nominally rated at 180,000 psi tensile strength and substantially stronger than Grade 8 hardware. These bolts are designed to resist corrosion and extreme heat, making them an ideal choice for your project. Each 12 point header bolt kit includes six 12 point bolts and nuts.