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.