ARP 400-1403 Header Bolts Header Stud Kit12Point Head16PiecesARP manufactures a variety of premium grade boltand stud kits to facilitate installation of exhaust headersincluding the popular stainless stud kit with 12-point nuts. TheStainless 300 material is not affected by corrosion or extremeheat, making it ideal for the application. Whats more, the compact12-point nut lets you easily slip a socket close to the pipe. EachARP accessory stud or bolt kit includes the specificnumber of parts for your application, plus premium-quality washersand hex or 12-point nuts, as required. Studs are manufactured witha unique nut-starter nose that helps prevent cross-threading. Studsand bolts come either black oxide chrome moly or Stainless 300.Both are nominally rated at 170,000 psi tensile strengthsubstantially stronger than Grade 8 hardware. Specially drilledNASCAR models are available for those who wish to safety wiretheir header bolts to prevent loosening.Special NASCAR model header bolts are available that aredrilled for use of safety wire. Perfect for any racer who desiresthe ultimate in security. Available for small block and big blockChevrolet engines, plus many universal applications.