The CSKO12124 is a 12 x 12 x 4 in (305 mm x 305 mm x 102 mm) Type 1 mild steel junction box with a flat screw cover and knockouts on all four sides. It is designed for general purpose indoor commercial use as a junction, pull or switch box, making it a fit for electricians, electrical contractors and facilities teams who need a ready-to-wire steel box at this size.

The body is formed and spot welded from 16 gauge steel, and the enclosure and cover are finished in ANSI 61 gray powder coating. Easily removed knockouts are provided on all four sides; the CSKO12124 drawing shows knockout diameters of 0.76/1.13 in, 1.01/1.38 in and 1.26/1.75 in. The flat steel cover is fastened with plated steel screws, keyhole slots let the cover be lifted off without removing the screws entirely, and a grounding location is embossed in the body.

Enclosure dimensions are 12 in high, 12 in wide and 4 in deep (305 mm x 305 mm x 102 mm), with the drawing showing 4.06 in overall depth. Shipping weight is 9 lbs (4.08 kg), and the part ships packaged in a bag. The 12 x 12 in face is listed in 4, 6 and 8 in depths; CSKO12124 is the 4 in version.

Through holes in the back allow wall mounting. The box is rated UL-50 Type 1 (UL File E65324) and CSA Type 1 (CSA Cert. LR21001), complies with NEMA Type 1 and IEC 60529 IP20, and is listed as REACH and RoHS compliant.