The Monument 170 has been especially designed for removing stiff backnuts from awkward placed taps and to make tap installation a more rapid process this tool is for 12-inch BSP and 34-inch BSP taps The Monument 170 tool stays in position on the tap tail so can be used with one hand and uses mechanical advantage of the thread of the tap tail to remove stiff nuts Ideal for24mm AF 25mm AF 26mm AF and ribbed 27mm AF 29mm AF & ribbed AF 32mm Comes complete with 38-inch cordless drill adaptor and comes with full user instruction manual