Anti-slip Ladder Rung Covers for Vertical Ladders By installing Ladder rung covers not only is this slip hazard eliminated but the lifespan of the ladder rung is greatly increased. These heavy duty products are easily fitted onto existing square & round ladder rungs using adhesives. Surface grade: Fine profile - 1mm aggregate (1/16” approx.). Colour coded in a wide range of colour schemes to suit individual locations, but Safety Yellow colour will be supplied if any colour code is not specified.