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 5985-01-472-3278
NSN 5990-01-463-2279
NSN 6650-01-421-2370
NSN 5998-00-495-0027
NSN 6645-01-421-4007
NSN 6145-00-022-0818
NSN 5950-01-039-2259
NSN 5935-01-450-2898
NSN 6320-00-676-9387
NSN 5950-00-432-0915
NSN 5935-00-249-3319
NSN 5915-00-009-4351