Faithfull Hex Key Set of 9 Long Arm Metric contains a selection of professional quality keys made from fully hardened Chrome-Vanadium steel. All keys from 4mm and bigger have chamfered edges to prevent damage to the blade and fittings. The long arm design allows access to deep set screws or difficult to reach places. The handy storage caddy ensures that the key set can be safely stored in pockets and toolboxes. The key sizes are clearly shown on the caddy.