Our 4" ALUMINUM bullet hinge with zerk fitting allows for it to be greased. This is a heavy duty hinge. These are weld on hinges great for Jeeps, BBQ, tailgates, gates, doors, smokers, etc Aluminum body with stainless steel pin & bushing w/ zerk Length - 4" Thickness - 11/16" Diameter 5/8" Pin Size 3/8"