The Spectre Magna-Clamp 3568 is designed to fit 1 inch inside diameter as well as AN-20 heater or water hose that have a maximum outside diameter of 1.50 inch including any covering. The stainless steel gear drive clamp features a two-piece chrome plated aluminum housing that provides secure tightening at an affordable price. Magna-Clamps are designed to perform as well as they look and are ideal for race, street, and show.