Conduit Ground Clamp; Conductor Size 8 AWG, 6 AWG, 4 AWG (Copper); IPS Size 2-1/4 to 4 Inch; Size 6-3/8 Inch L; Installation 1/2 Inch Rigid Threaded Hub; Material Plain Brass; Approval UL 467; Used On Threaded Conduit to Pipe; ROHS Compatible; Applicable Standard Federal Specification A-A-50552, NEMA FB-1