Halex, 1/2 in. Flexible Metal Conduit (FMC) Screw-In Connectors , 04405B, 50 per pack , Silver , 0.5 Inch Connect flexible conduit to metal enclosures with this 1/2 in. Flex Screw-In Connectors (50-Pack). They are designed with a reversible locknut to ensure ground continuity by cutting through protective coatings. These connectors are UL and CSA listed. Features Connects flexible metal conduit to metal enclosures such as steel outlet boxes and load centers High-strength, die-cast zinc alloy body and locknut UL and CSA listed Reversible locknut cuts through protective coatings on boxes and enclosures to ensure ground continuity USA SHIPPING estimates delivery times and we work to get your item to you as quickly as possible and within those times, but please know it may take slightly longer than the estimate.