21 mm Drive: 1/2 inch Application: The Fixman drive deep socket allows you to use a socket wrench in inaccessible places, especially if you have an extension on the driver. Made of high-quality Chrome vanadium steel, increased contact area with a"/> 21 mm Drive: 1/2 inch Application: The Fixman drive deep socket allows you to use a socket wrench in inaccessible places, especially if you have an extension on the driver. Made of high-quality Chrome vanadium steel, increased contact area with a"/>