Set of 12 ARP Grade 8 Stainless 3/8-16 x 1 Header Bolts with 6 point head. These bolts are rated at 170,000 psi and have a reduced flange diameter to clear large tube headers. We also include a set of our extra thick small OD header washers to protect your coated headers. These washers are the same diameter as the flange on the bolts.