Product Description: Upper: Hex Rod 1 4 (6.35mm) Length: 60mm Material: chrome vanadium steel Contents: 3 x 60mm Screwdriver Bit Holder Feature: -High hardness and non-slip, large torque and long and durable. -Suitable for drill, screwdriver, batch head and others to transfer. -Extend all kinds of screwdriver bits, uses screwdriver head conversion. -1 4 hex shank, quick change and release, fits any standard size screwdriver bit, 1 4 impact driver and hand screwdriver. Specifications: 1 4 (6.35mm) hex shank, length: 60mm Quick change and release, fits all electric drills, 1 4 impact screwdrivers and handheld screwdrivers. Ideal for r sleeve and gasket, extending the connecting rod. Perfect for drill, screwdriver, batch head and others to transfer Built-in magnetic (only the bottom of the hole part), quick quick release will greatly improve work efficiency. < p>NOTE: Only the bottom of the hole part is magnetic, the role of magnets is only to lock the screwdriver bits more tightly. And it is not suitable for double head screwdriver bits, only suitable for single hex shank drill bits Note: A. Only the bottom of the hole part is magnetic, the role of the magnets is only to lock the lots more tightly B.You need to pull the knurled end against a spring to release the bit p> C. It does NOT fit double head screwdriver bits, only fit hex shank drill bits