Anti-slip Ladder Rung Covers for Vertical Ladders By installing Ladder rung covers (square, round or diamond) not only is this slip hazard eliminated but the lifespan of the ladder rung is greatly increased. These heavy-duty safety products are easily fitted onto existing ladder rungs using adhesives. Standard safety yellow ladder rung covers highlight each rung when climbing or descending the ladder. Surface grade: Coarse grade: 1-3mm aggregate (1/16”–1/8” approx.).