Hubbell-Raco 248 2-1/8-Inch Deep Welded Square Electrical Box with (4) 1/2-Inch & (2) TKO Eccentric Side Knockouts, 4-Inch Includes cable clamps suitable for use with steel & alum armored cable, mci cable, mci-a cable, and flexible conduit Durable pregalvanized steel construction Acceptable for use in two hour fire rated wall The product is ul listed.. suitable for use without a bonding jumper in circuits up to 600 volts 30.3 cu. In. Wiring capacity