Worm-drive hose clamps made of 304 stainless steel material. With 3/8"-wide non-perforated bands, these clamps feature rolled-up edges to prevent hose damage. They are designed to evenly distribute tension force and work well in many different applications with a high mechanical load.Hoses are measured by inside diameter, so select a clamp with a maximum opening at least 1/4" larger. We recommend two clamps per hose end below the waterline.