CER NEMA 1 Rated Lay-In Wireway is designed to protect wiring in applications where dust, dirt, oil and water are not serious problems. All wireway sections and fittings are open on one side for lay in installation. No "pulling through" is necessary. CONSTRUCTION:- CSA certified- Code gauge cold rolled steel- Phosphated then polyester powder coated - standard colour ASA61 Gray- 1/2" - 3/4" combination Knockouts on 24" centers.- Covers held closed with captured plated screws and easily installed wing nuts (supplied). - Coupling supplied with each length of wireway.