Accurately install Alarm Lock T2, T3 and T3 Prox pushbutton locks using the HIT-118 drill guide.  Simply attach to door using the existing 2-1/8" crossbore for alignment and all drill points for thru bolts combination change holes, etc are accurately located with hardened drill bushings. Drill guide has bushings on both front and back plate to allow drilling from both sides of door. The HIT-118 is for use with 2-3/4" backset and 1-3/8" to 2" thick doors. Locks with a 3-3/4" or 5" backset requires the optional HIT-BAK adapter.