A hinge is a mechanical bearing that connects two solid objects, typically allowing only a limited angle of rotation between them. Two objects connected by an ideal hinge rotate relative to each other about a fixed axis of rotation all other translations or rotations being prevented, and thus a hinge has one degree of freedom. Hinges may be made of flexible material or of moving components. In biology, many joints function as hinges like the elbow joint. A hopper is a storage container used to dispense liquids or solids through the use of a chute or tube to restrict flow, sometimes assisted by mechanical agitation or a pump. A hopper may be refrigerated or heated. Features. Right SK2SB Weldment Hopper Hinge. Made with high quality materialSpecifications. Length 1.05 in / 2.67 cm. Width 3.85 in / 9.78 cm. Height 0.9 in / 2.29 cm