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 5855-01-649-3606
NSN 5855-01-068-3683
NSN 5985-01-377-1053
NSN 6220-00-868-5651
NSN 5975-01-380-4799
NSN 5965-00-368-8204
NSN 6240-01-012-3976
NSN 6220-00-058-5002
NSN 6685-01-195-6528
NSN 6105-00-518-1854
NSN 6220-01-321-5909
NSN 5935-00-500-6138