Monument adjustable fitted 2 jaw wrench diy is an adjustable basin wrench for use in tightening or loosening nuts in awkward positions particularly those underneath basins or baths the teeth on the jaws will grip uneven shapes as well as pipes hexagons squares etc the swivelling head allows access where fixed spanners will not operate round cross section steel handle with removable tommy bar size 15 and 22mm 12 and 34 in