With an ergonomic design and a wide range of approved wire combinations, this wire connector is a perfect fit for the majority of residential and commercial applications. Ergonomic wing design makes installation easy and painless, even when installing multiple wire connectors Posi-Grip™ surface provides superior twisting power, even when hands are greasy or damp Finger friendly plastic for an even more comfortable grip Rounded edge for safe and comfortable installation Live action variable volume spring expands to accommodate even more wires with less twisting effort