These multi-range hex-head connectors cover 95 percent of everyday applications making them the simple choice for all of your wire connection needs. Don't worry about using a hex tool to install - you can't over-torque this connector because it's patented hex-head design strips out at UL torque saving the wires and your fingers. Inside the connector a zinc-plated square wire spring ensures a secure connection that resists corrosion. The thermoplastic shell is designed for long-lasting strength and resists chemicals while the deep skirt supports smooth wire entry and coverage of stripped wires. Use for large appliances, timers, indoor lighting, switches, ballasts, junction box, air conditioners.