The Spectre Magna-Clamp 3368 is designed to fit 3/4 inch inside diameter as well as AN-14 heater hose that have a maximum outside diameter of 1.10 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.