Tap Wrench Handle Type Knurled Handle Shape Sleeve Fractional Tap Capacity 1/16 in to 1/4 in Machine Screw Tap Capacity 1/16 in to 1/4 in Metric Tap Capacity 6.35 mm Overall Length 6 in Function Firmly Hold Square or Round Shanks Plunger Operated By Knurled Sleeve The Spring Inside The Sleeve Causes Plunger to Back Off When Pressure is Removed