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This replacement Roller is designed to fit Lock Bar Spring LMD931 or LMD831. The Roller and Spring are inserted into your lock bar, to allow the door to be secured and locked over the door jamb when shut.If you are unsure of your locker handing, please refer to the Locker Handing Diagram in picture 2.Click to shop our locker parts to fit Medart brand lockers - Hinges, Latches & Springs to Fit Medart Brand Lockers