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A small cap that covers the point where cables pass into a counter, plinth or digital display stand. Power and data leads run through it instead of over the edge, so the cable run stays tidy and does not look like an afterthought on the show floor.
This is an accessory for branded display products rather than a stand-alone item, so it is worth sorting at the same time as the stand itself. If you are not sure whether your unit takes one, send the product name or a photo.