Features: The hole saw and mandrel are selected from carbon steel, with a reinforced plastic guide template that can remain durability even with frequent use. This door lock installation kit contains 1 U-shaped plastic guide template, 2 hole saw of different sizes (1 inch/25 mm and 2-1/8 inch/54 mm), and 1 mandrel with drill bit. The cutting depth of the hole saw is 50mm. Our door lock installation kit is exquisitely designed to ensures precise drilling and tight between the door lock and the door frame. Tips for use: To avoid damage to the door panel, do not drill completely through one side of the door. Instead, drill holes in the middle of both sides of the door to ensures the integrity of the drilling. This door lock fitting tool set is suitable for a variety of wood door lock sizes commonly available on the market. Adjustable plastic rail template accommodates doors 1-3/8" to 1-3/4" thick and supports lock cylinder spacing of 2-3/8" to 2-3/4". This door lock installation kit is suitable for all types of wood doors. It is not only suitable for home use, but also suitable for carpenters to use during decoration. Specifications: Component:Metal Size:Approx.13x7x6cm/5.12x2.75x2.36inch Package Includes: 1 Set Door Lock Fitting Tool note: 1.Please allow 1-2cm errors due to manual measurement, making sure that you not mind before order. 2.Due to the differences between different monitors, the picture may not reflect the actual of the item.