No. 16 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 5930-01-565-0470
NSN 6110-01-043-8291
NSN 4140-01-241-4659
NSN 5915-01-115-4242
NSN 6610-01-256-7938
NSN 5945-00-947-0547
NSN 5999-00-009-6659
NSN 6650-00-397-0372
NSN 4140-01-474-7950
NSN 5945-01-502-5961
NSN 5945-01-359-8834
NSN 6145-00-310-7443