This Faithfull Long Arm Hex Key Set contains a selection of professional quality keys made from fully hardened chrome vanadium steel. All keys from 4mm have chamfered edges to prevent damage to blade and fittings. 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. Metric Sizes: 1.5, 2, 2.5, 3, 4, 5, 6, 8, 10mm