Usage: The insulated butt splice connectors are great for automotive use, Home applications, or occasional project | Material: Butt connectors are made by high-quality Brass and PVC, and finished by tin-plated | Gauge: 85pcs 22-16AWG(Red crimp connectors), 75pcs 16-14AWG(Blue crimp connectors), 40pcs 12-10AWG(Yellow crimp connectors) | WIRE-STOP Structure: This design of wire connector helps you to insert wire into the right place to ensure the effect of crimping | High-quality: Wire connectors comply with RoHS and UL standards.