The Tech Team Band-Style Stainless-Steel Hose Clamps use a key, rather than a screw-style tensioner for ease of use. The 5/16” wide #304 stainless steel band fits hoses from 7/16” – 3/4” (11 - 19 mm) in diameter. Oversize key-style turn closure for installation without tools ensures a good repair with a tight fit. Clamps should be doubled up on both ends of the hose. One with the key/screw on the left, and one on the right. This ensures uniform tension and a tight connection in applications where heat and vibration are present. Includes five (5) hose clamps.