Description: This magnetic bit holder is quick to connect and disconnect with screwdriver bit, and extend the bit length for convenient use. Made of high quality 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 chrome-vanadium steel, with high harness and strong construction. Can be used to extend all kinds of screwdriver bits and drill bits, greatly improve work efficiency. Bit holder can quickly connect and disconnect with screwdriver bit and ensure stay in place while driving. Universal 1/4inch quick hex shank fits most electric drivers and hand-held drivers. Specifications: Condition: 100% Brand New Material: Carbon Steel + Chrome Vanadium Steel Hex Shank Diameter: 1/4in(6.35mm) Length: approx. 6cm / 2.36in Weight: approx. 188g Package Included: 10 x Screwdriver Bit Holders