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