Material: Chrome Vanadium Steel. Finish: Nickel Plated, Polished Chrome. Corrosion Resistance, Durable, Hardened, Tempered. Spring Loaded. Contents: 1 1/2in F x 3/8in M Socker Converter, 1 1/4in F x 3/8in M Socket Converter, 1 3/8in F x 1/2in M Socker Converter, 1 3/8in F x 1/4in M Socket Converter. Ball Bearing. Packaging: Euro Hook, Header Card. Silverline Socket Converter Set in Silver