TEKTON 25216 Long Arm Ball Hex Key Wrench Set, Metric, 9-Piece Chrome vanadium steel wrenches are heat treated and black-oxide finished Ball hex ends allow up to a 25 degree entry angle to reach around obstructions Chamfered straight ends insert smoothly into fastener head, reducing wear Long arm wrenches provide extra reach and greater torque 9-pc. Long arm ball end hex key wrenches (Metric): 1.5, 2, 2.5, 3, 4, 5, 6, 8, 10 mm