Door lock installation kit. For metal or wood doors, 1 3/8 in. to 1 3/4 in. thick. Easy guide template. Back sets from 2 3/8 in. to 2 3/4 in. Includes one guide template, one 2-1/8 in bi-meta hole saw, one 1 in bi-meta hole saw, mandrel and adaptor. Workmanship and material defects warranty.