Bi-metal door lock installation kit for metal & wood doors, completes installation in 3 easy steps, kit includes: 2 bi-metal hole saws with arbors, a 2 sided self centering jig that will accommodate both 2-3/8" backset & 2-3/4" backset, a butt hinge template, a router guide & router bit for the face plate, 1 piece per card.