MultiSize Extension Bar Set Includes three adjustable lengths: 80 mm, 120 mm, and 140 mm to fit a range of drilling tasks and working depths. Reliable Locking System Each interface uses a dependable locking mechanism with magnetic support to securely hold screwdriver bits in place during use, improving safety and efficiency. Efficient Grip and Rotation The outer sleeve is separated from the bit shaft, allowing you to maintain a firm grip while smoothly rotating the screwdriver for precise onehanded positioning. SafetyFocused Guide Sleeve The selfretracting guide sleeve covers long screws during driving, reducing wobble and protecting your fingers from potential injuries. Use scenarios Reaching recessed or hardtoaccess screws in cabinets, furniture, or machinery installations. Aligning and driving long screws in furniture assembly, enabling precise, onehanded operation. Guiding screws through panels or thin materials to reduce wobble and improve control.