sprockets 34 and 36 is moved into raceway area 28 as seen in fig2 when moved into an engaged position first sprocket 34 simultaneously engages toothed aperture 16 of first yoke arm 14 a and first toothed area 42 of bore 40 of wrench head retaining section 22 while the second sprocket 36 simultaneously engages toothed aperture 18 of second yoke arm 14 b and second toothed area 44 of bore 40 of wrench head retaining section 22 at such a time the wrench head portion 20 is locked against rotation of any desired position and the wrench can be used for installing or removing a nut or performing some other mechanical operation alternately only a single sprocket need be provided as seen in fig3 when axle shaft 32 is pushed in a first direction indicated by arrow u201c a u201d first sprocket 34 disengages from first toothed area 42 of bore 40 of wrench head retaining section 22 and is engaged only in toothed aperture 16 of first yoke arm 14 a and second sprocket 36 moves into raceway area 28 of bore 40 of wrench head retaining section 20 where there are no teeth to engage in this position i e the disengaged position wrench head portion 20 can be freely articulated relative to body portion 12 of articulating wrench assembly 10 since wrench head portion 20 can be rotated about axle shaft 32 to change the.