STRONG BITING SPRING: for a secure, reliable and long-lasting connection in all your pigtail applications UNIQUELY FLEXIBLE SPRING that has generous room for expansion into greater wire range and reuse DUAL COLOR CODED RED/YELLOW: one connector does the job of two traditional connectors in the majority of applications UL LISTED for 600 volts on with copper wire only and 1000 volts maximum in signs and lighting fixtures (luminaries) WIRE RANGE: 22-8 AWG for solid and/or stranded copper conductors FLEXIBLE SKIRT helps prevent copper exposure for enhanced safety