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ANSI Standard Cap and Pin Type U120bp Tempered and Toughened Glass Electrical Insulator for High Voltage Line. It supports at least 120 kilonewtons (kN) of weight. This is like holding up two small cars. Its wide shape helps wind clean off dirt. It is perfect for dirty or foggy areas. The glass shatters if it breaks. This makes it easy for crews to spot broken parts on a pole.