This aluminum weld-on hinge has a barrel size of 3/4" and uses a stainless steel pin and ring. There is no grease fitting. These hinges are perfect for trailers, tool boxes, waste containers, wood burning stoves and more. The weight capacity is 550 lbs. The hinge is 5-1/4" long with a 15/32" pin. Receive a quantity discount when you buy 10 or more and 48 or more.