The inner diameter is 1-1/8 inches, and the bottom outer diameter is approximately 2 inches. Made from durable TPR rubber and reinforced with a metal insert for a non-slip grip and longer wear. Ideal replacement tips for almost any bathroom item – universal compatibility fits most bath benches and shower chairs. Its unique angled legs with non-slip rubber caps distribute the user's weight over a larger area, making the shower chair extremely safe and stable. Tool-free assembly makes it easy for anyone in the family to assemble for use in minutes. These replacement caps are designed to fit perfectly on any brand of bath benches and are designed not only to add but are quick and easy to replace your old caps. Fits all brands with 1-1/8 inch tubing. TPR rubber is durable and corrosion-resistant. Its unique angled legs with non-slip rubber caps distribute the user's weight over a larger area, making the shower stable. Wider caps with practical drainage holes help manage areas with excess moisture. Unique large drainage holes enhance the overall seating experience and also allow water to drain effectively, reducing the risk of slipping.