Die-cast zinc housing, quick-release plug interior.

Ground terminal accepts wires up to 8AWG, other terminals up to 10AWG.
Cable protectors are constructed of plated steel, and provide strain relief and protection against abrasion (on matching 12092). Interior can be readily removed by loosening the single set screw in the cable clamp, and then depressing on the spring clip release with a screwdriver. The interior then readily slides out. The interior slides back into the housing and locks securely into place with a high-tension metal clip. After the cable clamp is tightened, the plug is ready for use.