LARGE Solar Grounding Lugs and Clips are made of stainless steel 304.it is used between solar panel and solar rails,to create an electrical path to the earth grounding.
Solar Panel Grounding Lug and Clips
LARGE Grounding Clips and Washers are used on the rails and under the solar panels. with many bumps on the washers and clips to pierce the anodized layer of the aluminum rails and solar panel's frame.
If so, when the thunderstorm weather,the grounding system can take a return circuit to the earth ground.and then protect the solar modules.
Grounding lug and Clips Pictures :