NSI GRC-58 5/8 Inch 10 to 1/0 AWG Silicon Bronze Standard Duty Ground Rod Clamp | World Electric Supply
Southern Grounding UGC Universal Grounding Clamp, fits 1/2", 5/8" & 3/4" Ground Rods, Wire Range 1/0 - #10, Bronze Copper Alloy | Codale Electric Supply
Grounding Clamp - Direct Burial Ground Rod Clamp w Screws - 3/8 Inch Cold Water Pipe, Electrical Bonding - UL Listed - Antenna, Satellite Dish, Cable TV - 1 Pack - Amazon.com