This is a Du-Bro RC 1/16" Ball Driver.

Features

The perfect tool for getting at those hard to reach places.
Durable steel driver.
Transparent yellow, + shaped plastic handle with driver
size engraved.
Ball wrenches make it possible to turn socket head screws or
bolts from any angle.

Includes

One Ball Driver

Specifications

Size: 1/16"
Overall Length: 4-3/4"