Widely Used Connector Blocks: Wire connectors are suitable for 0.5-4mm/20-12 AWG solid wire and 0.2-2.5mm/24-14 AWG flexible wire. Widely used in building wiring, industry, lighting, security, communications, and networking, etc. Instead of traditional insulating tape and braided butt connectors, technological innovation reduces wiring time by 60-70%. Easy to use: First, remove the wire sheath (11~12mm), simply slide the orange clip slightly upward at 90, insert the stripped wire, and press the lever to secure the wire. It can create a solid connection without the need for other tools. Each wire connector has a test hole, so you can check whether the terminal is powered without unplugging the connector. Safe Electrical connectors are made of the best nylon PA6 modified flame-retardant insulation material, which features long service life, no corrosion, anti-aging, 4KV pressure, and anti-electric shock resistance, making them much safer than traditional electrical tape. The inner layer is made of high-quality copper with high conductivity, which can definitely prevent breakage during use. Reliable and reusable: Compact wire connectors can be managed separately for different wires, preventing short circuits and fires caused by aging due to the shifted frequency band of the wires. It is also recyclable. Meet your needs: This kit includes 110 pieces: PCT-212 * 55 pieces (2 terminals), PCT-213 * 45 pieces (3 terminals), PCT-215 * 10 pieces (5 terminals).