Conduit Grounding Bushing; Type Threaded; Trade Size 2-1/2 Inch; Wire Size 6 AWG Solid to 250 KCMIL Stranded; Lug Type Tin Electroplated 6061-T6 Aluminum Alloy; Throat Type Insulated; Diameter 3-3/16 Inch; Height 13/16 Inch; Material Ball Burnished Mirror Smooth Die-Cast Zinc; Standard Package 25; Approval UL 514B, UL (Canada and US); Used On IMC/Rigid Conduit; ROHS Compatible; Applicable Standard Federal Specification A-A-50553, NEMA FB-1; Insulator Material Nylon; Insulation Temperature 150 Deg C