Made of heat-treated vanadium steel with flexible spring steel shaft, anti-rust and durable,1/2 inch shank and 250/350mm length.Flexible shafts allow improved access in tight space, maintains excellent rotational torque-transfer from ratchet to socket.Spring-loaded balls detents lock in to prevent parts from slipping into machineries.Square drive radiuses corners reduce tool and socket wear.Flexible Socket works in areas that conventional screwdrivers can't reach solve the repair the car engine stricture uninstall screw easily.Equipped with a wrench clamping grooves, which can be clamped by a wrench. When there is no ratchet wrench, it can be used to clamp the wrench. The extension rod turn the sleeve.Specifications: Material:SteelType:250mm/350mmPackage Includes: 2Pcs Extension Barnote: 1.Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order.2.Due to the difference between different monitors, the picture may not reflect the actual color of the item.