IVY Classic 27003 Carbon-Steel Lock Installation Kit with Guide Template for Wood Doors, Carded Adjustable guide template for easy and exact drilling with snap-lock arms for selecting door width and backset Adjustable plastic guide template fits 1-3/8-inch and 1-3/4-inch thick doors Adjustable plastic guide template fits 2-3/8-inch and 2-3/4-inch backsets Includes 1-inch and 2-1/8-inch carbon-steel hole saws and a D type arbor with pilot drill