These 1/4" drive metric sockets have a one-quarter inch square drive that's compatible with drive tools of the same size. - They come in metric sizes that are measured in millimeters to fit fasteners with a metric size head. Socket Size / 11 mm Socket Shape / 6-Point Material / Alloy Steel Finish / Chrome Socket Depth / Standard Drive Type / Hand Drive Size / 1/4 in Measurement Type / Metric Standards / ASME B107.110-2012, SAE AS4984A Number of Points / 6 Overall Length / 7/8 in