TengTools 185800109 Increasing / Reducing Adapter Set, ratchet Square Drive Tang Size: 6.3 (1/4"), 10 (3/8"), 12.5 (1/2"), 20 (3/4"), 25 (1")mm (inch), Number of tools: 17, Drive: 1/4, 3/8, 1/2, 3/4Inch, Chrome Vanadium Steel

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