Milescraft 1215 Strike Door Plate Mortising Kit Easy to use drop in template design with clearly marked templates Sturdy steel template frame with door thickness selector knob for 1-3/4 and 1-3/8-Inch doors Includes durable tungsten carbide tipped router bit with ball bearing eliminating the need for guide bushings on your router Centered tape measure tabs and easy measure guide ensure correct and precise installation of door hardware