Ground terminal accepts wires up to 8AWG, other terminals up to 10AWG.
Cable protector (on matching 1255) is constructed of plated steel, and provides strain relief and protection against abrasion.

Cole Hersee spring grip contacts contain a self-adjusting spring band that maintains contact pressure from socket to pin. Greater contact pressure not only gives greater electrical efficiency, but also makes coupling and uncoupling uniform, and minimizes buildup of dirt. In competitive plugs, conventional contacts tend to widen after repeated use: the Cole Hersee plug has individually sprung sockets to insure maximum contact year after year.

Diecast metal housing.
Replaceable interior.
Wiring codes are identified on the insulator.
Cable clamp holds all wires securely.