Copyboard cover hinge compatible with models MF 4010, 4012, 4018, 4120, 4122, 4140, 4150, 4300, 4310, 4318, 4320, 4322, 4330, 4340, 4350, 4352, and 4370, 4380.Designed to replace the hinge component for the copyboard cover.proper alignment and function of the cover mechanism.Made to fit specified models for performance.