This lock installation hole opener is designed for accurate, repeatable door lock and mortise installations. Its adjustable slide rail and quick locking system make setup fast and reliable, reducing alignment errors and saving installation time. Key features Adjustable slide rail bearing: slide left and right to increase opening range and ensure stable, reliable operation during drilling. Quick locking with 4 limit rings: set the required opening length with the limit rings and lock it quickly to match the lock head width. Clamping range: supports door thickness from 3.5 to 10 cm for a wide range of indoor door and room lock installations. Tapping depth: 13 cm drilling depth suitable for common home lock mortise sizes. Wide compatibility: suitable for indoor doors, room mortise locks, and general lock replacement or installations. Benefits Faster, more consistent installations by locking the opening length and stabilizing the guide rail. Reduced risk of misaligned holes thanks to lateral slide adjustment and secure positioning. Versatile use across standard home door thicknesses and lock head sizes, eliminating the need for multiple jigs. Typical use scenarios Home renovation: Installing or replacing mortise locks on interior doors where consistent hole placement is required. Locksmith work: Onsite lock changes and repairs that demand quick setup and repeatable drilling depth. Carpentry and construction: Door fitting during builds or remodels when multiple doors require identical lock placement. Simple setup tips Adjust the slide rail laterally to align with the desired hole center. Position the clamp to fit door thickness between 3.5 and 10 cm and secure it. Set the 4 limit rings to the required opening length based on the lock head width. Drill to a maximum tapping depth of 13 cm for typical mortise locks. This tool focuses on accurate hole positioning and straightforward adjustment to make lock installation tasks more efficient and reliable.