Direct Burial Tin-Plated Copper Ground Connector, 4 to 14 AWG
https://nsiindustries.com/product/direct-burial-tin-plated-copper-ground-connector-4-to-14-awg/
NSI grounding and bonding products provide flexible solutions for a wide range of grounding and bonding applications in the field. Use copper ground connectors for grounding or continuous loop bonding of copper wire in direct burial applications.