The Aeroflow Performance dual bead black coated constant tension stainless steel hose clamps are the most cost effective way to ensure a consistent seal on your hoses without damage. The inner dual bead design puts band-sealing pressure where it is needed, providing 30 percent more sealing performance than standard worm drive clamps. This allows superb sealing characteristics and is safe for all soft hose use such as air to air and coolant applications.