Installing the Alarm Lock DL1200, DL1300 or the PDL1300 narrow stile door locks can be completed quickly and accurately with the HIT-32AL3 drill guide. Backset alignment is accomplished with the HIT-22 guide (supplied), then just align vertically and screw the guide to the door. After the installation the screw holes are under the lock case and not visible. Just drill all the through bolt holes from both sides of the door and install the lock.