Arlington 3-1/2" Str Flex Conn - Zinc Die-Cast, Concrete TightZinc Die Cast 3 1 2 in Knockout Squeeze Connector Two Screw, Concrete Tight When Taped Meta description: Zinc die cast 3 1 2 in knockout squeeze connector with round end stop. Two screw design for flex, AC, and MCI cable. Concrete tight when taped. Package size 1. TL; DR Who This Is For Electricians and contractors terminating flexible conduit or armored cable into large knockout boxes where a durable metal connector with a positive end stop is