The Hillman Group 3515 3/8-16 By 4-Inch Stainless Steel Carriage Bolt, 5-Pack Carriage bolts have a domed head that is not designed to be driven A bolt with a square shoulder under a rounded head which resists turning when the nut is tightened Stainless steels are used for their corrosion resistance, high-temperature strength, scaling resistance and low-temperature toughness Quantity per pack: 5