These are designed to be used with the ear clamps (MC1and MC2) that are provided in our CV boot kits. Unlike a normal pair of pliers that can cut the clamp during installation, these are designed specifically for use with ear clamps and have a built in hammer action that makes quick work of the ear clamp fitment. The ear clamp pliers not only squeeze the clamps together they also lock them in position by pressing the ear firmly closed. Extremely robust, they can handle the daily rigors of garage life.