controls for operating the wrench in the preferred embodiment the lower jaw set 23 is fixed relative to housing 39 and the upper set 21 of the stacked horseshoe configuration is reversibly rotatable relative to lower jaw set 23 referring back to fig1 in the preferred embodiment the positionable wrench holder 15 comprises an upright post 51 mounted on the rig floor and having an arm 53 with one end connected to the upright post and extending radially outward it is preferred that the combination of arm 53 attached to post 51 permits rotation of the arm 53 about the vertical axis of post 51 additionally it is preferred that arm 53 be variously positionable through the height of post 51 means for either of these latter two preferred features are known and readily accomplishable by one of ordinary skill in the art the other end of arm 53 is connected to duplex drill pipe wrench 13 the combined assembly permits the movement and positioning of duplex drill pipe wrench 13 at appropriate locations within the three dimensional reach of wrench holder 15 in the preferred embodiment the positionable wrench holder 15 combination of arm 53 and post 51 comprises a crane having tackle 55 for connecting to and suspending the duplex drill pipe wrench 13 from arm 53 at various heights and tackle 57 means for positioning wrench 13 radially with respect to post 51 in an alternative preferred embodiment the arm 53 of positionable wrench holder 15 comprises a track and the duplex drill pipe wrench 13 is mounted on wheels for positioning the wrench radially with respect to the post 51 it is envisioned that this embodiment be accomplished in at least two ways first the track may be suspended.