Hexagon Shank Bit Extension Rod Drill Screwdriver Adapter Product Description This magnetic bit is quick to connect and disconnect with screwdriver bit, and extend the bit length for convenient use. Made of steel with heavy duty construction, study and long lasting. Features: The interface has a locking mechanism, with built-in strong magnet. The extension bar is mainly made of-vanadium steel, with high and strong construction. Can be used to extend all kinds of screwdriver bits and drill bits, greatly improve work efficiency. Bit can quickly connect and disconnect with screwdriver bit and ensure stay in place while driving. Universal 1/4inch quick hex shank fits most drivers and hand-held drivers. Specifications: Condition: New Material: Stainless Steel + Vanadium Steel Color: Black + Optional Type(Length): 60mm, 100mm, 150mm Hex Shank Diameter: 1/4 in (6.35mm) Package Included: 1 x Screwdriver Bit