Specifications: 1/4"(6.35mm) hex shank, length: 60mm Quick change and release, fit all electric drills, 1/4" impact drivers and handheld screwdrivers. Ideal for exchanging sleeve and joint, 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. NOTE: Only the bottom of the hole part is magnetic, the role of magnets is only to lock the screwdriver bits more firmly. And it is not suitable for double-headed screwdriver bits, only suitable for single hex shank drill bits Note: A. Only the bottom of the hole part is magnetic, the role of magnets is only to lock the batches more tightly B. You need to pull the knurled end against a spring to release the bit C. It does NOT fit double-head screwdriver bits, only fit hex shank drill bits. Specifications: Shank: 1/4"(6.35mm) Hex Shank Length: 60mm Material: Chrome Vanadium Steel Feature: -High