Monument 173 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 for 12-inch and 34-inch BSP 25 mm 27 mm nuts 29 mm ribbed 32 mm nuts The MON173 is complete with 38-inch cordless drill adaptor 12-inch square drive extension tube and full user instructions For removing stiff backnuts and rapid tap installation for 12-inCH BSP and 34-inch BSP TapsTool stays in position on the tap tail Uses mechanical advantage of the thread of the tap tail to remove stiff nuts Monument Stiffnuts Professional Boxed Kit 12-inch and 34-inch BSP 25 mm 27 mm nuts 29 mm ribbed 32 mm nuts Complete with 38-inch Cordless drill adaptor 12-inch Square Drive; Extension tube and full instructions