This is a 10 pack of high-quality rubber shower hose washers. They are suitable for standard shower hoses and 1/2" tap connectors. The washers have the following dimensions: 20mm Outer Diameter (OD), 11mm Inner Diameter (ID), and 2mm thickness. These are specifically designed as 1/2" BSP shower hose washer replacements. Instead of replacing the entire shower hose due to a leak, you can simply replace the two washers located at the top and bottom connections. This is a cost-effective and easy solution to fix leaks.