ARP valve cover bolt kits are offered in a choice of chromoly steel with a black oxide finish or corrosion-proof polished stainless steel. You also have a choice between hex head and easy-access 12-point designs. The heads feature a wide base for better load distribution and sealing.Duramax 6.6L LB7 hex valve cover bolt kitValve Cover Fastener Style: BoltFastener Finish: Black oxideFastener Material: 8740 chromolyFastener Head Style: Hex headThread Size: 6mm x 1.0Washers Included: Yes Hold-Down Tabs Included: No Quantity: Sold as a set of 46.