High quality materials Made of nylon, copper and sheet metal. The shell is made of high quality nylon. It keeps open flame and electrically insulating. The conductive piece is copper, which has perfect electrical conductivity. . Easy WiringQuick wiring without stripping or soldering. Simply insert the wires and squeeze with pliers, then a reliable and secure connection is made, very quickly and easily. . Protected against electric shock, mild, waterproof, dustproof, fireproof, heat-resistant. .Wiring areaRed electricity thief: 0.5-1.0mm AWG: 22-18 Maximum current: 10A / Blue Electricity thief: 0.75-2.5mm AWG: 18-14 Maximum current: 15A / Yellow Electricity thief: 4-6mm AWG: 12-10 Maximum Current: 24A / royal blue electricity thief: 0.75-2.5mm AWG: 18-14 Maximum current: 15A .Wide range of applicationsSimply insert an insulated cable and push it through a special contact to seal and push. This is an unnecessary stripping, widely used in electric vehicle wiring, industrial, electrical, home appliances, aerospace, marine, factory, workshop and scientific projects. It can be highly recommended to electricians, technicians and home users. .