Grease these hinges without the hassle of disassembly or the mess of lubricating from the outside. They have a grease fitting for injecting lubricant to reduce wear, prevent rust and seizing, and eliminate squeaks. The compact bullet shape takes up very little space, yet hinges are strong enough for large, heavy doors. Weld the male half of the hinge to the frame and the female half to the door—then you can quickly lift the door off without removing the pin.