These clamps are easier to install than worm-drive clamps—crimp the pinch points with pinch-clamp pincers for a secure hold. They are also known as ear clamps. Clamps withstand vibration and temperature changes without loosening. They are for firm plastic and rubber hose and tube. Double Pinch—Clamps accommodate a greater variation in hose diameters than single-pinch clamps, and can be used on thicker-walled hose and tube. Material: Zinc-Plated Steel Band width: 9/32"