Features: Material: Chrome-Vanadium Steel for home use Purpose: This adapter set is designed to provide a securely locked in extension to your existing tool. Provides additional length to reaching into a multitude of hard to reaching spaces. The spring ball lock ensures a tight fit into the driver head to prevent slipping during use. Specifically machined to fit securely into a hand held driver, drill driver or impact wrench. Steel ball joint rods: the special design of the steel balls, which can bring much convenience to you,extension rod for bits Bit adapter: easy to install and remove, which save you much time and labors,bit adapter rods Notice: 1.Actual color may be slightly different from the image due to different light effect 2.Please allow 1-3cm deviation due to manual measurement Material: Chrome-vanadium steel Size: As shown Package List: 3 Piece Impact Socket Adapter Set