This is a T-Handle 7/64" Hex Key from Allen. The Plas-T-Key is Allen's standard handle and features a plastic grip, which provides durability and extra torque while in use. Each hex key is 2.125" long with a shaft composed of a black oxide-finished, tempered steel alloy that is terminated in a straight end.
These hex keys can be used in a variety of ways, including robotics or for the 6-32 screws used by most Actobotics products.