a lock installation system of template drill and router guides that clamp to the door to prepare doors for locking and latching devices of many different brands . the system uses changeable template drill guides clamped to the faces of the door to drill the cross hole and other specialty holes needed . the edge drilling is done with an attachment for the proper size bit or with a ¼ inch pilot hole and hole saw . the attachment also allows the pre - drilling of the screw holes for mounting the latch assembly . after removing the edge drill setup , there is a router template to cut the mortise for the latch for commercial locksets . there is an attachment for residential locks to router cut the mortise cut out for the latch assembly . the embodiment will work on beveled and square edge doors of the two most common back sets . the embodiment will do door edge center , off set drilling and latch assembly mortising . there is also a means to help align the embodiment on a door that has a pre - existing preparation . the smaller version of this embodiment is for where the door edge latch mortising is not required .