JL Jeep Wrangler OUTER Door Hinge 16 Rust Proof Stainless Steel Bolts SetRust and Corrosion Proof 18 8 Hardened Stainless Steel. The additional $2 for the black stainless is to pay for the bonding process to turn the stainless black. 16 hardened countersunk stainless bolts Our door hinge bolts have a smaller head than the standard OEM bolts to help prevent water pooling. Any bolt that is not stainless, like ours, or titanium, will rust. In some coastal areas this process might take months or even weeks. We highly recommend