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 5930-01-417-8287
NSN 2925-01-250-2731
NSN 5960-01-414-1677
NSN 6620-01-115-2926
NSN 5920-00-254-8429
NSN 6135-00-961-3603
NSN 6135-00-726-4142
NSN 5998-00-755-7709
NSN 6110-01-251-1256
NSN 4140-01-560-2801
NSN 5950-00-597-8644
NSN 6650-00-419-4146