Accurately install Arrow Revolution and Yale Intouch series pushbutton locks using the HIT-151 Drill Guide. This unit, thru-bolts to door, using the existing 2-1/8” crossbore for alignment. All required mounting and function holes are located with hardened drill bushings on both sides of the template to allow drilling from either side of door. Standard drill guide will accommodate doors up to 2” thick with a 2-3/4” backset.