Spectra MS LED Fixed Top Mount570 Fixed Top Mount More than a simple top mounted base, the 570 allows for a full 450of rotation. This means that light coverage can be a full circle, plus another quarter turn which ensures no blind spots. The 570 base has a built in stop to prevent the internal wiring from binding. A built in friction mechanism ensures the light will not rotate when the vehicle is in motion. 2 rows of intense flood LEDs provide the ultimate in scene & work area