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25 pc25 pc. Allen wrenches/ hex keys set includes most commonly needed SAE and metric sizes. Allen Wrench Hex Key Set- SAE/ Metric 25 pc. Allen wrenches/ hex keys set includes most commonly needed SAE and metric sizes. Allen wrench set sizes: SAE - 1/20", 1/16", 5/64", 3/32", 7/64", 1/8", 9/64", 5/32", 3/16", 7/32", 1/4", 3/8". Metric - 1.27mm, 1.5mm, 2mm, 2.5mm, 3mm, 4mm, 4.5mm, 5mm, 5.5mm, 6mm, 7mm, 8mm, 10mm. Great addition to any toolbox includes hard to find sizes. Come in a neat vinyl pouch for storage.