Size InformationDoor Latch Kit measures approx 16.5cmx7.9cm/6.50inchx3.11inch Professional ToolDoor latch can not only replicate your latch shape on the door, but also dig the door lock hole through the chisel on top, and install the door latch with the built in driver bit No Need To MeasureAccording to the thickness of the door, flip the 90 fence and insert it into the slot (1-3/8" or 1-3/4" is available) For Round Or Square LatchesReversible latch mortise machine provides scoring for round and square latches, greatly reduces the number of tools you need to bring to the job site Built In Scoring and Chisel ToolsThe latch install set has switchable square or round blade and a chisel on top, Help cut out professional latch shapes and door lock holes Package Includes: 1 Door Latch Installation Kit Note: Please allow slightly errors 1-2cm/0.39-0.79inch differences due to manual measurement.