The universal 1 / 4 "hexagon handle is used for the sleeve, and each hexagon nut screw driver head is clearly marked, which can be used for various quick change chucks, flashlights and screwdrivers. 10PCS SAE：5/32, 3/16, 7/32, 1/4, 9/32, 5/16, 11/32, 3/8, 7/16, 1/2.
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