Heat shrinkable insulating boots are suitable for the insulation protection of the incoming and outgoing line terminals of the ring network switch cabinet and the cable connections. They are also suitable for the insulation protection of the terminal connections of various cable distribution boxes and box-type substation devices. This product has excellent insulation properties. , flame retardancy, thermal stability, heat dissipation, softness, no cracking and resistance to electrical carbon marks and other excellent properties. It also has the characteristics of fast shrinkage, simple operation, safety and reliability, etc. There are two types of straight-through and corner types to choose from. .