Irwin® Hanson® hex threading die, measurement system: metric, m4x0.7 thread, NC thread, 3/8 in thickness, 1.137 in OD die, 1 in hex, right thread, high carbon steel. Irwin® 6617 Hanson® Hex Threading Die, M4x0.7 Thread NC Thread, 3/8 in thick, 1.137 in OD Die, High Carbon Steel