{HEAD ~ Spirit level extenders} 9 can be provided in different lengths in {TAIL ~ the order} of say, 12″±4″ or the metric equivalent 
{ HEAD ~ Spirit level extenders } 9 can be provided in different lengths in { TAIL ~ the order } of say , 12″±4″ or the metric equivalent
HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH