The CWST412 is a 1 ft (12 in) straight section of Type 1 lay-in hinge cover wireway, built with knockouts in gray painted steel. Its 4 x 4 in cross-section is a compact cross-section that sits between the 2.5 x 2.5 and 6 x 6 sizes in the series. It is intended for electricians, panel builders and OEM machine builders who need an enclosed channel to route and protect wiring.

The section measures 4 in x 4 in x 12 in (102 mm x 102 mm x 305 mm), with 4 in inside dimensions and outer drawing dimensions of 4.36 in / 4.11 in. A single hinged door, 11.94 in long on the drawing, runs the length of the section, so conductors can be laid in from the front rather than pulled through.

Knockouts are shown on the drawing as 1.13 in and 0.88 in diameter knockouts, laid out along the side at 5.50 / 5.50 in spacing. The drawing also shows 0.27 in and 0.31 in diameter holes, with 11.00 in spacing on the bottom view. Shipping weight is 4 lbs (1.81 kg). Note that CWST Series wireway lengths no longer include a joiner kit; order one separately as needed.

The CWST412 is listed under UL File E186830 and is RoHS and REACH compliant. It ships in a box and carries UPC 623980261812 and UNSPSC 39131710. Hammond's lay-in wireway is part of a system of sections, elbows, tee fittings and other components for protecting cabling in machine building and general plant wiring.