Bronze grounding clamp with conduit hub and swivel, #10 SOL - #6 STR AWG conductor size range, 2 1/2" - 4" (63.5mm - 101.6mm) iron pipe size, 1/2" - 3/4" (12.7mm - 19.1mm) EMT 1/2" (12.7mm) rigid conduit hub size, 4.25" (108.0mm) pipe clamp screw length.