{HEAD ~ The spirit level extenders} 9 are preferably formed from extruded aluminum, and include a top surface 14 on which a spirit levels leveling face 2 is intended to be placed, and {TAIL ~ a bottom surface} 16 to be placed on a surface whose inclination is to be determined  
{ HEAD ~ The spirit level extenders } 9 are preferably formed from extruded aluminum , and include a top surface 14 on which a spirit levels leveling face 2 is intended to be placed , and { TAIL ~ a bottom surface } 16 to be placed on a surface whose inclination is to be determined
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