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.

Sizes.
0.7. 0.9, 1.3, 1.5, 2, 2.5, 3, 4, 4.5, 5, 5.5, 6, 7, 8, 10mm.
1/16in, 5/64, 3/32, 7/64, 1/8, 9/64, 5/32, 3/16, 7/32, 1/4, 5/16, 3/8, 0.28, 0.35, 0.50in.