Description: 【C Clamp Design】: This door lock installation kit features a unique C clamp design that allows for self clamping, ensuring no damage to the door surface during installation 【Precision Alignment and Drilling】: Equipped with an alignment window and taller bushings, this kit ensures accurate height placement and straight drilling for a professional finish every times 【Versatile Compatibility】: The Door Lock Jig kit includes 2 adjustable bushings that both standard backsets and common door thicknesses, making it suitable for most lock sizes used today 【Construction】: Made from quality PP and carbon steel, this Locks Hole Opener is designed to work efficiently on wooden doors, providing long term performance 【Compact Dimensions】: With dimensions of 13.6cmx9.8cmx11.1cm/5.35inchx3.86inchx4.37inch, this compact set is easy to handle and store, making it a convenient addition to any toolkit Specification:       Size Chart: 13.6cmx9.8cmx11.1cm/5.35inchx3.86inchx4.37inch Package Includes: 1 Door Lock Installation Kit Note: Please allow slightly errors 1-2cm differences due to manual measurement.