Features. These clamps expand and contract with the hose in response to temperature changes in the application.. They cannot be over or under tightened, and are installed and removed easily using either manual or pneumatic tools.. A dorrlflake finish offers five times the corrosion protection over traditional zinc plating.. Constant tension on the assembly that does not require tightening.. Rohs compliant. Series - Ctb. Material - Steel sae 1074. Color/finish - Dorrlflake black. Nominal size - 22. Material thickness - 1.3 in.. Maximum dia - 20.5 mm. Clamp width - 15 mm. Item weight - .28 lbs.