Rugged and Durable Design: This set contains 600 P12 brown wire connectors, made with grooved textured wings that grip your centerline securely and provide greater twisting leverage. The plug-in metal spring ensures a stable, secure connection to your application without accidental detachment. SAFE INDUCED INSULATION: Wire nut connectors are made of high-quality nylon shell and metal spring. The insulating plastic housing keeps you safe during the wiring process, while the rugged thermoplastic housing withstands extreme temperatures up to 221°F (105°C). EASY QUICK CONNECTION: These heavy-duty wire connectors make quick connections to automobiles, building wiring, lighting fixtures and signs. Great for wiring connections, no soldering required; just push the stripped wires into the cover and tighten. They are safe and reusable. EXCELLENT PERFORMANCE: The wire cap has excellent performance. The high-quality copper in the wire caps not only provides excellent conductivity, but also improves current flow while reducing the potential for voltage instability. They are rated for voltages up to 600V when used in buildings and up to 1000V when used in lighting fixtures and signs. WIDE APPLICATION: Our durable and strong wire connector nuts lock your wires securely in place. Perfect for home theater, speaker wire, stereo wiring, automotive, marine wiring projects, home wiring projects, commercial or residential applications. Colour:As Shown Material:ABS Package Contents: 600 x Nut Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.