No. 12 spline size
An item having an internal drive at one end made to fit into the external drive end of a socket wrench handle, torque wrench, or power driven tool. The opposite end consists of various internal wrench shapes such as hexagon or square. It may include an integral universal joint.
Classification: Socket wrenches with or without handles, drives and extensions, parts, base metal
NSN 5835-01-350-0566
NSN 6650-00-195-7519
NSN 5990-00-838-1082
NSN 5985-01-628-5071
NSN 5915-01-428-9343
NSN 2925-01-224-1885
NSN 6650-00-195-7519
NSN 6610-01-331-6966
NSN 6220-01-087-0816
NSN 5950-00-565-5084
NSN 5990-01-414-7618
NSN 5895-01-475-9012