Metric/Imperial 30 Piece Hex Key Set. 15 Metric standard length & 15 Long reach imperial hex keys. In plastic case. Size range; 0.7, 0.9, 1.3, 1.5, 2.0, 2.5, 3.0, 4.0, 4.5, 5.0, 5.5, 6.0, 7.0, 8.0, 10.0mm Short Arm and 0.028, 0.035, 0.050, 1/16, 5/64, 3/32, 7/64, 1/8, 9/64,5/32, 3/16, 7/32, 1/4, 5/16, 3/8â? Long Arm.