♥ ADAPTABLES: These non-slip chair caps are perfect for fitting on benches, stools, and shower chairs with straight pipes measuring between (1 1/8" - 1 3/16") in diameter (not suitable for slanted pipes). Before purchasing, measure the tube size. ♥ NON-SLIP: The ferrule for shower stool are made of 100% natural moisture-resistant rubber to enhance grip and reinforced with a metal insert inside for increased traction and durability. ♥ SAFETY: These shower chair caps provide a safer experience due to their non-slip material and their 4 inches diameter at the base, allowing weight distribution over a larger area. ♥ PACK OF 4: Made of rubber, this pack of 4 grey chair caps is easy and quick to install on chairs and benches. ✔ EASY INSTALLATION: Tool-free assembly. It is recommended to use water, oil, or some type of lubricant to facilitate inserting the cap into the tube. Ensure it has been inserted correctly before use.