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This is a 12mm threaded 2.1mm lens that will fit the RMRC-420, 420xv, 480, 520, 540, LL600, 600XV, 740XV, and most other common CCD cameras. With the RMRC 1/3" CCD, this lens will give you an approximately 150 degree field of view (as opposed to the approximately 90 degree field of view from the stock 3.6mm lens).
NOTE: CCD lenses do not have an IR filter. If you are using a CMOS camera, you should purchase a lens that includes and IR cut filter or your video colors will not be correct in daylight!