Mishimoto High-Torque Worm Gear Clamps are a simple and effective solution to all your hose and coupler clamping needs. This 0.31″ 0.47″ (8mm 12mm) high-torque worm gear clamp is made from stainless steel to weather any environment and ensure a tight seal for years to come. Our high-torque worm gear clamps are also available in a wide variety of other sizes to suit everything from vacuum lines to intake pipes. Like all Mishimoto products, this 0.31″ 0.47″ (8mm 12mm) high-torque worm gear clamp is backed by our Mishimoto Lifetime Warranty.