Adjustable lengths for versatile reach: 80 mm, 120 mm, and 140 mm. This extension set adapts to different drilling tasks, reducing the need for multiple tools and enabling easier access in tight spaces. Secure locking mechanism with magnetic support: each interface combines a reliable locking system with magnetic assistance to keep screwdriver bits firmly in place during operation, improving safety and reducing bit loss. Design innovation for onehanded use: the outer sleeve and the separated bit shaft deliver a strong grip with smooth, unobstructed rotation of the screwdriver head, facilitating comfortable onehanded operation. Guide sleeve functionality for protection and stability: the selfretracting guide sleeve covers long screws, enhances stability while driving, and helps safeguard fingers from potential injuries. Practical use scenarios: Assembling flatpack furniture or cabinetry where longer screws and extended reach are needed, especially in confined spaces. Mounting fixtures or shelves in walls where precise alignment and finger protection matter. General DIY tasks that require consistent screw driving with a secure bit hold and controlled guidance.