UISOLAR grounding system is used for the Grounding purchase.The grounding washers/clips are used for the grounding each module and the guide rail with the pinholes on the wahsers to pierce the anodizing layer of the aluminum rails.We have different types of grounding washers for different rails'choices . Material : Grounding washers : SUS304 Grounding lug : Al6005-T5& SUS304 Bounding Jumper: Copper & SUS304
L feet and hanger bolts are used in tin roof installation. Commonly used hanger bolts are M10*200, M10*250 and M12*300.Of course, customized are available here.