A wide ranging set of 20 hex keys from Toolzone Tools. Set includes both metric and AF sizes. 1.5mm, 2mm, 2.5mm, 3mm, 4mm, 5mm, 5.5mm, 6mm, 8mm, 10mm, 1/16", 5/16", 3/32", 1/8", 5/32", 3/16", 7/32", 1/4", 9/32", 3/8". Fully hardened and  tempered steel with black oxide finish. Sometimes referred to as  allen keys. Superb value from Toolzone Tools.