CURT 7 16 Inch Forged Steel Clevis Slip Hook with Safety Latch, 40,000 lbs, 1 1 3 In Opening, 7 16" Pin Model 81970 Clevis Hooks Door is attached to the 9451346bsblo Door is attached to the hull of the box with stainless steel pillow block type hinges with self lubricating bushings and 5 16” stainless steel hinge pins Style All Purpose Chest Material Aluminum Install Time (hours) 1 Mounting Location Channel Color White Vehicle Type Compact Wheel Base Type Short the safety latch allows for a safety chain connection that won't come loose from vehicle vibrations or jarring on uneven terrain the chains should be cross underneath the trailer coupler