Often referred to as an allen key, the hex key is a driver designed for hex nuts and sockets, and are generally easier to turn and apply torque than more conventional screws. As such, they are ideal for when fasteners need to be adjusted or equipment needs to be dismantled. This standard short arm hex key set is a handy way to keep differing allen key sizes all in one place. Supplied in a plastic holder, the keys are neatly organised ready for precision work. Included in this 9 piece metric set are 1.5, 2, 2.5, 3, 4, 5, 6, 8 & 10mm. Carded.