Gradus CLS13/LBS45 is a two-piece PVC-u flooring profile designed to provide cable management for the Gradus illuminated stair edging system or to house the Gradus LED floor loom or Interlok Advance LED lighting system for walkway and aisle illumination. It has a 5mm gauge in order to accommodate thinner gauge carpets. The base is fitted to the floor first to house the cabling, then the top is clipped into place. The top is co-extruded with a clear or smoked window so that light can shine through when used as an illuminated floor system. When fitted, the compressed thickness of the carpet should always be a tight fit to the internal gauge of the combined top/base profile.