ITwoRowsShank

Returned by TwoRowsShankApi - a classic band with a channel carved on each face, carrying two parallel rows of stones. Multiple gems, so no single mother gem. Adds to IParametricObject:

Member	Meaning
RingSizeLabel / RingSizeRegion / RingDiameterMm	Ring size
TopProfile / MidProfile / BottomProfile	The band sections - IClassicProfile each
ExternalProfile	The outside-face profile - IClassicExternalProfile
Advanced	The band opening - IClassicAdvanced
Rail	The channel - ITwoRowsRail
Prong	The prong cross-section - ITwoRowsProng
Gems	The stones on the rails - IClassicGems
GemsEnabled / SetGemsEnabled	Master toggle for the stones
CuttersEnabled / SetCuttersEnabled	Whether the gem drill cutters are built

The band reuses the classic sections outright, so anything you know from IClassic applies here. Every setter regenerates the shank in place, re-baking stones, prongs and cutters.

The channel (ITwoRowsRail)

Member	Meaning
LayoutMode	"FULL", "SIDE_ANGLE" or "TOP_ANGLE"
StartAngle / EndAngle	Degrees - used with "SIDE_ANGLE"
TopAngle	Total arc in degrees - used with "TOP_ANGLE"
Width	Span of the channel along the face, mm
Offset	Depth carved into the band, mm
FitTolerance / Rotation	mm / degrees
RailMode	"DOUBLE" (one cutter per row) or "SINGLE" (one wider cutter)
CutOrientation	"ANGLED" (follows the face) or "HORIZONTAL"; single mode is always horizontal
CentralWall	Metal left between the two rows in double mode, mm
OuterBorder	Single mode: metal rim on each side of the band, mm
RowSpacing	Gap between the two gem rows, mm
EndMargin	Gap between the channel end and the first/last gem, mm
SetLayoutMode, SetSideAngles(start, end), SetTopAngle	Where the channel runs
SetWidth, SetOffset, SetFitTolerance, SetRotation	The channel section
SetRailMode, SetCutOrientation	How it is cut
SetCentralWall, SetOuterBorder, SetRowSpacing, SetEndMargin	The metal around the rows

Prongs (ITwoRowsProng)

Member	Meaning
ExternalDiameter / InternalDiameter	mm
Distance	mm
EndProngCount	Prongs added at each end of a row
SetExternalDiameter, SetInternalDiameter, SetDistance, SetEndProngCount