Bronze grounding clamp with conduit hub and swivel, #10 SOL - #6 STR AWG conductor size range, 1/2" - 1" (12.7mm - 25.4mm) iron pipe size, 1/2" - 3/4" (12.7mm - 19.1mm) EMT 1/2" (12.7mm) rigid conduit hub size, 1.65" (41.9mm) pipe clamp screw length.