This door lock installation kit is designed to help facilitate the installation of a lockset in a wood door. The plastic template fits doors that are either 1-3/8 in (34.93 mm) or 1-3/4 in (44.45 mm) thick and will accommodate a backset of 2-3/8 in (60.33 mm) or 2-3/4 in (69.85 mm). The plastic template ensures that the high carbon steel hole saws (included) drill straight and true holes for both the lockset and latch for smooth operation.