These bumpers are used as a cushion between the ladder and the pool wall. They will fit a ladder end that is either 1.7" or 1.9". Works with in-ground swimming pool ladders. Swimline is a leading manufacturer of swimming pool toys, inflatables, cleaning supplies, and covers. They have emerged as a well-respected leader within the industry through their dedication to product innovation and quality materials. Their new line of swimming pool and spa cleaning products, Hydrotools, has also become the quality standard when it comes to making your pool and spa shine. This product is backed by a 1-year manufacturer satisfaction guarantee!