This 30 piece hex hexagon key set from B&Q is ideal for use over prolonged period of time. It's chrome vanadium steel body is extremely durable and hard-wearing, whilst still resisting oxidation, corrosion and abrasions through prolonged periods of use. This set includes imperial 0.028, 0.035, 0.05, 1/16", 5/64", 3/32", 7/64", 1/8", 9/64", 5/32", 3/16", 7/32", 1/4", 5/16", 3/8". metric 0.7, 0.9, 1.5, 2, 2.5, 3, 4, 4.5, 5, 5.5, 6, 7, 8, 10mm.