Attributes . Unique long ferrule with more pronounced threads provides over four times UL pull-out requirements; Ferrule also provides maximum surface contact for better sealing and a continuous, permanent, positive metal-to-metal ground; Flame resistant, insulating insert recessed into hex-head wedge adapter protects against wire damage, without reduction in throat diameter; Space-saving hex-hub wedge adapter fits nearly flush against inside walls of enclosures, providing maximum wiring room; Suitable for wet locations . Names