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The Starrett 91 Tap Wrench is strong and well proportioned. It is nicely finished and the gripping surface is properly tempered. It will firmly hold square or round shanks. It is plunger operated by knurled sleeve, the spring inside the sleeve causes plunger to back off when pressure is removed. 9" (225mm) Length, 3/16-1/2" (4.7-12.7mm) Tap Size. A tap wrench used in combination with a drill tap is the traditional method to tapping (threading) a hole. This traditional method continues to be a preferred tapping method for when precision tapping is required on prototypes, one-off, post processing, and when minimal material exists around the hole. holes in a hole patterns is too significant to include in a machine program. In essence the tool has a basic "T-Wrench" configuration, which uses handles that extend from the center axis of the tap so that additional torque in the tap can be created. Since a tap requires a specific amount of material at a specific dimension in order to create an effective thread, this manual method can provide excellent feedback to the operator as they progress the tap into the thru-hole.