The design of the Blackjack® bushing has an integral, cast-on grounding lug for better ground continuity. This means that the Blackjack® bushing stands up to intense loads. The Blackjack® bushing’s cone-point mounting screw bites securely into both threaded and non-threaded rigid conduits. And the Blackjack® bushing’s nylon locking patch is designed to prevent the screw from loosening due to vibration. Grounding Bushing never has to be threaded onto a conduit. It is simply placed in position on either a threaded or non-threaded rigid or IMC conduit, with the grounding lug in perfect position to accept the grounding wire.