EXTENSION SET This comprehensive set features three adjustable lengths (80MM, 120MM, 140MM) to accommodate a wide range of drilling tasks with ease. LOCKING MECHANISM FOR SAFETY Each interface is equipped with a secure locking mechanism and magnetic support, ensuring screwdriver bits stay tightly in place during operation for improved safety and efficiency. USER-FRIENDLY DESIGN The innovative design separates the outer sleeve from the bit shaft, allowing for a solid grip while enabling smooth rotation for accurate positioning of the screwdriver head with one hand. PROTECTIVE GUIDE SLEEVE The self-retracting guide sleeve effectively covers long screws, allowing precise positioning while minimizing wobbling and safeguarding your fingers from injury. Use scenarios - Assembling flat-pack furniture where long or recessed screws require reach and precise alignment. - Mounting cabinets or shelves that need extended reach and stable guidance for accurate screw placement. - Working in tight spaces or overhead installations where adjustable lengths provide reach without sacrificing control.