This product is a "U" shaped PVC extrusion usually used to cover a protruding edge. The PVC fits snugly over the top of the edge and often needs to be secured into place with glue or adhesive.
Before you order this product you need to know the width of the edge you want to cover, and also in some cases, how much of the side surface from the top of the edge you want the PVC to cover.
This product is available in black, grey and white and measures 8mm in width and 10mm in height.