The union 2650 rebated mortice latches are suitable for timber doors hinged on the left or right and requiring lever handle operation please note these are not suitable for use with unsprung lever handles these latches are suitable for 13mm rebate latches with a case size of 645mm 25 inchs are suitable for handles with a backset of 44545mm latches with a case size of 76mm 3 inches are suitable for handles with a 57mm backset