Spectre Magna-Clamps 2166 are designed to fit 1/4 and 5/16 inch inside diameter as well as AN-6 vacuum and fuel hoses that have a maximum outside diameter of 0.610 inches including any covering. The stainless steel gear drive clamps feature a two-piece blue anodized aluminum housing that provides secure tightening at an affordable price. Included are 2 Magna-Clamps that are designed to perform as well as they look, the magna clamps are ideal for race, street, and show.