Specifications: 1/4" (6.35mm) hex shank, length: 60mm Ideal for exchanging the 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 Product Description Note: HAS. Only the bottom of the hole part is magnetic, the role of the magnets is only to lock the lots more tightly B.You have to pull the knurled end against a spring to release the bit p> C. It is NOT suitable for double head screwdriver bits, only suitable for hex shank drill bits Specifications: Shank: 1/4"(6.35mm) Hex Shank Length: 60mm Material: chrome vanadium steel Feature: -High hardness and non-slip, large torque and long service life and durable. -Suitable for drill, screwdriver, batch head and the like to transfer. -Extend all kinds of screwdriver bits, use screwdriver head conversion. Note: The data is manual measurement, please allow 1-3cm error, due to differences between light and screen, there will be a certain color difference, the specific received in kind prevail.