Description: brand new and high quality High hardness, non-slip, large torque, long life and durable. The screwdriver head has strong magnetic so that it can self-lock the connecting rod. Strong practicability, it can change external six angle into internal six angle. It can join electric screwdriver, screwdriver, screwdriver nozzle, screwdriver head. It applicable for exchanging the sleeve and the joint, prolonging the connecting rod. It can be flexibly used in situation of narrow space, use it to reach the work-place where hands can not reach. Specification: Material: Carbon Steel + CRV Shank shape: Hex shank Shank diameter: 1/4 inch (6.35mm) Sleeve diameter: 10mm Sleeve significant depth: 9.5mm Color: As the picture shown Quantity: 3 pieces Package Includes: 3 pieces Bit Holder(4 Pack) Note: As different computers display colors differently, the color of the actual item may vary slightly from the above images. There is 2-3% difference according to manual measurement. Please check the measurement chart carefully before you buy the item.