Bronze grounding clamp with conduit hub and swivel, #10 SOL - #6 STR AWG conductor size range, 1 1/4" - 2" (31.8mm - 50.8mm)iron pipe size, 1/2" - 3/4" (12.7mm - 19.1mm) EMT 1/2" (12.7mm) rigid conduit hub size, 2.22" (56.4mm) pipe clamp screw length.