For a spiral, the number of finishing turns at the upper end of the spiral. 
   Namespace:   Autodesk.Revit.DB.Structure  
  Assembly:   RevitAPI  (in RevitAPI.dll) Version: 18.0.0.0 (18.2.0.0) 
  Since:  2009 
Syntax
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Remarks
 Applies only to instances where RebarShape.Definition is of type RebarShapeDefinitionByArc, and its Type property is equal to the value RebarShapeDefinitionByArcType.Spiral. 
 Exceptions
| Exception | Condition | 
|---|---|
| Autodesk.Revit.Exceptions ArgumentOutOfRangeException | When setting this property: turns must be between 0 and 100. | 
| Autodesk.Revit.Exceptions DisabledDisciplineException | When setting this property: None of the following disciplines is enabled: Structural. | 
| Autodesk.Revit.Exceptions InvalidOperationException | This Rebar is not an instance of a spiral shape. -or- This method applies only to shape driven rebar. |