Features: *Versatile Extension Set: This providing a range of sizes (80MM, 120MM, 140MM) to accommodate various drilling tasks with ease. *Secure Locking Mechanism: Each interface features a reliable locking mechanism combined with built-in magnetic support, make sure that your screwdriver bits are held tightly in place during use, enhancing safety and efficiency. *Innovative Design: The outer sleeve and bit shaft separation design allows for a firm grip while enabling the screwdriver to rotate smoothly, making it easy to position the screwdriver head accurately with one hand. *Self-Retracting Guide Sleeve: The self-retracting guide sleeve effectively covers long screws, allowing for precise positioning while driving screws, which minimizes wobbling and protects your fingers from injury. *Wide Compatibility: Designed to be suitable for various tools, this adapter fits hex shank power drills, 1/4 inch for impact drivers, and handheld drivers, making it an essential addition to any toolkit. Specifications: *Product Name: Extension Bar Adapter Bit Holder *Material: Carbon Steel *Size: (Approx. ) 80mm-115mm, 120mm-200mm, 140mm-240mm *Shank: 1/4'' Hex (6.35mm) *Adapter: 1/4'' Hex (6.35mm) *Color: Silver and Black Package Content: Package1#: 1*Bit Holder (Optional) Package2#: 2*Bit Holder (80mm+120mm) Package3#: 3*Bit Holder (80mm+120mm+140mm) Note: 1. The real color of the item may be slightly different from the pictures shown on website caused by many factors such as brightness of your monitor and light brightness. 2. Please allow slight manual measurement deviation for the data. [COMPREHENSIVE SET] Includes adjustable lengths of 80MM, 120MM, and 140MM to tackle diverse drilling tasks efficiently. [RELIABLE LOCKING SYSTEM] Each bit holder features a dependable locking mechanism paired with magnetic support to your bits stay securely in place throughout use, improving safety. [USER-FRIENDLY DESIGN] The innovative separation design between the outer sleeve and bit shaft provides a solid grip while allowing smooth rotation of the screwdriver head for precise positioning. [EFFECTIVE GUIDE SLEEVE] The self-retracting guide sleeve covers long screws effectively, facilitating accurate screw driving while minimizing wobble and protecting your fingers from injury. [MULTI-TOOL COMPATIBILITY] This adapter is compatible with hex shank power drills as well as handheld drivers, making it an essential tool for both home improvement projects and professional applications.