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Features: 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 fits 2-3/8-inch and 2-3/4 inch backsets Professional Quality: the hole saw and arbor are made of durable carbon steel, coupled with a reinforced plastic guide template, which allows this door lock installation kit to ensure long-lasting performance even with frequent use Easy Lockset Installation: this adjustable guide template allows for easy and accurate drilling, and the snap-lock arm can be applied to select door widths and backsets; No worries installation in a few simple steps Notice: this door lock installation kit is compatible with wooden doors only; Do not drill through the door only on one side, you should drill bore hole halfway on each side of the door. Please note: the physical slightly color difference or difference, does not affect the use, please do not mind, thank you! Specifications: Brand: COOFARI Material: Plastic Compatible Material: Wood Package Contents: 1 x Door Lock Installation Kit Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.