This Faithfull Short 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. 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. Imperial Sizes 1/16, 5/64, 3/32, 1/8, 5/32, 3/16, 7/32, 1/4in AF