The Rebate Kit becomes necessary when using a Mortice Latch or Lock on rebated doors as these are designed with standard square edges which do not fit well into the rebated sections. The Rebate Kit provides a shaped surround for the Latch or Lock mechanism that will ‘level’ the rebate on the face of both of the doors at the point where the Latch or Lock is placed – thus allowing the doors to latch into place securely.