Made with a blue, vinyl-insulated, butted-seam barrel that protects components by offering a secure fit to ensure optimal performanceIt has a funnel-designed polyvinyl chloride sleeve so you won’t have any trouble inserting wiresHas a spring-like tongue that provides a tight fit around the stud, leaving no wiggle roomFits size #6 studsWorks for a range of wires measuring 16 to 14 AWG