10pc metric hex keys on a ring from Toolzone Tools. These hex key are sometimes referred to as allen keys. The hex keys are made from heat treated hardened steel providing added strength and durability. Sizes include: 1.5mm, 2mm, 2.5mm, 3mm, 3.5mm, 4mm, 5mm, 6mm, 8mm and 10mm. A quality product from Toolzone Tools.