LightRail 5.0 Commercial Drive KitLightRail 5 Commercial Drive 4 RPM kit From its triple duty extruded aluminum track, wide and stable carriage with steel on steel carrier bearings to the high torque 4 RPM instrument grade drive motor with ball bearing output shaft and sure grip dual drive design, it is more than capable of moving 2 or 3 lights side by side or fore and aft per cross bar and as many as 9 lights (or six lights to accommodate larger hoods) with the available add on