IMC/Rigid Conduit Nipple; Type Threaded Male/Hex Head; Trade Size 4 Inch; Diameter 5-3/16 Inch; Length 1-5/8 Inch; Throat Type Non-Insulated; Material Ball Burnished Mirror Smooth Die-Cast Zinc; Standard Package 10; Approval UL 514-B, UL (Canada and US), CSA; Used On IMC/Rigid Conduit; RoHS Compliant; Applicable Standard Federal Specification A-A-50553, NEMA FB-1