Door Hole Drilling Kit for Wooden Doors: designed to work well with wood doors in the most common lock sizes for everyday use; Adjustable plastic guide template fits 1-3/8-inch and 1-3/4-inch thick doors and accommodates 2-3/8-inch and 2-3/4-inch backsets Professional Quality: the hole saw and arbor are made of durable carbon steel, combined with a reinforced plastic guide template, ensuring long-lasting performance even with frequent use Easy Lockset Installation: the adjustable guide template allows for easy and accurate drilling; the snap-lock arm adjusts to fit various door widths and backsets; simple installation in a few steps Notice: this door lock installation kit is compatible with wooden doors only; do not drill through the door from one side only—drill the bore hole halfway from each side of the door Set: A Material: plastic Color: red Package Contents: 1 x Door Lock Installation Kit Only the above package content is included; other items are not included Note: Light reflection and different display settings may cause slight color variations compared to the actual item; measurement may vary by +/- 1-3 cm