Ear clamps provide a permanent, non-adjustable connection that resists loosening due to vibration, making them ideal for applications requiring a leak-free seal. Perfect for fuel lines and coolant hoses.The following four sizes are available in each kit and correspond to the sizes utilized in many of our products. Kit includes:• 21 mm - 10 count• 17 mm - 10 count• 14.5 mm - 10 count• 14mm - 10 count • Pincer pliers - Optional A note on clamp types: Not all clamps are created equal! Standard screw-on clamps, or worm clamps, always have a flat spot. Those clamps provide uneven force around the circumference of the hose, eventually damaging your lines. These crimp-style clamps, also known as Oetiker or ear clamps, provide even pressure in a perfect circle, and they won't loosen up over time like worm clamps!