BX-FLEX Connectors features a set screw type, straight assembly. Engineered with a combination screw head that securely affixes steel cables to electrical junction boxes or enclosures using slotted screw driver. Not suitable for use with aluminum cables or aluminum flexible metal conduit. Long lasting, naturally corrosion resistant zinc die cast construction; BX sizes 3/8”, 1/2” and 3/4” available in stock and ready for fast delivery. Knockout sizes from 1/2” to 3/4”. UL listed.