For construction worker, carpenter, electrical/mechanical worker and maintenance worker, car mechanical worker Inserting bits side is sleeve chuck type like the Impact driver's sleeve mechanism; Pin and O-ring are equipped with for Impact wrench Sq drive Makes 1/4" Hex shank bits usable to 1/2" Sq drive Impact wrench; 1/2" Sq drive Impact wrench will be able to tighten screws and so on with this item; 1/2" Sq drive anvil models are applicable 1/4" Hex shank Screw bits and Drill bits become applicable to Impact wrench with this item and that means to widen Impact wrench usage

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