HIGH SAFETY: These pliers are made of insulating modified nylon and tinned copper for high flammability and high conductivity. They are waterproof, corrosion-resistant and aging-resistant. Reliable Connection: Thanks to the spring-clamping technology, the clamping force of the connectors can be automatically adapted to the thickness of the wire, which makes the wire connections vibration resistant and maintenance free. Easy to use: no tools required. Just lift the lever 90, put the wire in and push the lever back down. It greatly facilitates your work. Each clamp has a test opening which makes it easy to test and wait. Universal connectors: they are suitable for solid and twisted conductors from 0.08 to 2.5 m and flexible conductors from 0.08 to 4 m. Ideal for lighting systems, building wiring, communication systems and security alert systems. There are a total of 60 reusable connection terminals: 30 x 2 terminals, 20 x 3 terminals, 10 x 5 terminals.