Conduit Locknut; Trade Size 4 Inch; Diameter 5-1/4 Inch; Thickness 3/16 Inch; Material Zinc Electroplated Steel; Installation Threaded; Standard Package 25; Approval UL 514B, UL (Canada and US), CSA; ROHS Compliant; Applicable Standard Federal Specification A-A-50553, NEMA FB-1; Application Fasten Conduit to Opening in a Box or Enclosure