Manufacturer: ARP. Nut - 1/4-20 in Thread - 5/16 in 12 Point Head - Stainless - Polished - Universal - Set of 10.
Arp 400-1210 3/8 x 1.000 SS 12pt header bolt kit
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ARP 401-8341 3/8-16 SS 12pt Nut Kit 10pk
ARP 454-2101 SB Fits Ford SS 12pt Intake Manifold Bolt Kit
Arp for 400-8390 M6 X 1.00 (M8 wr) SS 12pt nut kit
