Finally, door lockset and deadbolt installation is as easy as 1-2-3. Use MIBRO kit for easy installation on wood and metal interior and exterior doors. Kit includes: EZ-Guide template, 2 M3 Bi-metal hole saws and drill arbor with HSS pilot drill bit. The kit also includes instructions on how to successfully install your lockset or deadbolt. The patented EZ-Guide template accommodates 1-3/8 in. and 1-3/4 in. door thicknesses. It also accommodates 2-3/8 in. and 2-3/4 in. knob and lock back-sets. Changing the thickness and backset on the template is simple and quick. No more ruined doors. Lock installation really is an easy project.