Compatible with track heads with double locking adapters
NTE-854: Jason Square Track Head NTE-855: Jason Round Track Head NTE-880315: 8″ Dipper Track Head NTE-880330: 12″ Dipper Track Head NTH-910: Architectural Cylinder Line Voltage MR16 GU10 Track Head NTH-920: Architectural Cylinder Line Voltage PAR20 Track Head NTH-930: Architectural Cylinder Line Voltage PAR30 Track Head