The faithfull three piece set of hand tap wrenches designed for use in hand tapping and reaming operations each wrench features a heavy duty ductile steel body with a knurled chuck cap a four point clamping system helps to increase the range of tap sizes that can be used and provide a firm non slip grip for accurate control three sizes cover the following metric and imperial size taps m1 m4 116in 532in m4 m6 532in 14in m6 m12 14in 12in