General Tools 166 Plain Tap Wrench, Capacity No.12 to 1/2-Inch The #166 tap wrench is perfect for creating straight and accurate thread holes in your work piece The sliding T-Handle provides a large gripping surface and allows for maneuverability and leverage in tight spaces No. 12 to 1/2" tap wrench capacity Tap wrench can also be used with reamers, drill bits, screw extractors and other hand-turned tools