Heat treated and precision machined. Contains 20 combination 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 17, 19, 20, 21, 22, 24, 25, 27, 30, 32mm. 5 open ended 6x7, 8x9, 10x11, 12x13, 14x15mm. 5 ring 6x7, 8x9, 10x11, 12x13, 14x15mm.
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