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 5855-01-258-5161
NSN 5996-01-100-1499
NSN 6220-00-045-8110
NSN 6220-01-646-6342
NSN 6105-01-479-2174
NSN 2925-01-283-6740
NSN 5945-01-342-3358
NSN 6650-00-792-8577
NSN 6620-01-339-1238
NSN 5975-00-106-9568
NSN 5996-01-278-7225
NSN 6130-01-185-0310