These 3/8" drive SAE sockets have a three-eighths inch square drive that's compatible with drive tools of the same size. - Sockets come in sizes that are measured in inches and fractions of an inch to fit fasteners with an SAE (inch) size head. Socket Size / 5/16 in Socket Shape / 6-Point Material / Alloy Steel Finish / Chrome Socket Depth / Standard Drive Type / Hand Drive Size / 3/8 in Measurement Type / SAE Standards / AS4984A, ASME B107.110-2012 Number of Points / 6 Overall Length / 1 3/32 in