ARP  623-0750  6230750 Stainless Steel 42437 Hex Bolts - Pack of 5 Bolts have a diameter of 3/8", a standard thread pitch of 16, an under head length of 0.750, and the wrenching is 3/8 Rated at 170,000 PSI, which is considerably stronger than Grade 8 hardware Manufactured from polished Stainless 300 steel, a proprietary alloy that is impervious to rust and corrosion Heads are traditional hex style Packaged on convenient 5-pack card