Metric Ratcheting Hex Wrench With 9 Most Commonly Used Metric Hex Key Sizes: 1.5mm, 2mm, 2.5mm, 3mm, 3.5mm, 4mm, 5mm, 5.5mm, 6mm, High Strength Tempered Steel Handle, Chrome Vanadium Steel Keys With Black Oxide Coating For Hardness, Comfortable Grip.