Hexagon Keys are six sided wrenches for driving socket screws which are used mostly on machinery for fastening parts tightly together.

Fully hardened chrome vanadium.

Set of 9 long arm ball ended.

Sizes.
5/64, 3/32, 1/8, 5/32, 3/16, 7/32, 1/4, 5/16, 3/8in.