6 Pc Long Arm Hex Key Wrench Set- METRIC Long Arm wrench set is heat treated extruded alloy steel, with black oxide finish for durability. Allen wrenches T-handle design increases turning power and provides a sure comfortable grip Plastic-handles have size stamped on each allen wrench All wrenches in the set are from 6" to 9- 1/2" in length. Allen wrench sizes: 3mm, 4mm, 5mm, 6mm, 8mm and 10mm