This is a battery connector lock with a matching key and a screw. It has a black molded plastic housing that covers the metal parts. It is compatible with the CSC Motorcycles FT750 e-bikes series of electric bicycles, which have a flush battery that blends with the frame design. This lock secures the battery to the bike and prevents theft or tampering. You may need to replace this lock if you have misplaced your key, if the lock mechanism is faulty, or if the battery connection is loose and causes power interruptions. This is an original stock part from CSC Motorcycles.