Designed for use with taps, reamers, screw extractors, and other tools with a square shank. 1pc 1/2""Drive: working range 6-12mm, Jaws adjust to tightly secure taps to 1/2"". 1pc 3/8"" Drive: working range 0-6mm.Fits all 3/8"" square drive wrenches. For use in tight workspaces. Makes tapping and threading easier."
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