March 3, 2016 – Arlington’s 4×4 FSCB44 box and single-gang FSCB24 box promise a simple way to install a steel electrical box inside a concrete block wall.

They have 1/2-in. and 3/4-in. knockouts, and screw hole patterns for devices. The spring clip holds the box securely against concrete block. For added convenience, bracket ends break off for use on thicker block walls. Arlington boasts these concrete block boxes promise the lowest installed cost in the industry.