From: http://www.partstown.com/gold_bond/gldbpcs3
iss shelving clip
GLDBPCS3 Mfr Part #: PCS3 GOLD BOND
Also: https://www.kitchenofglam.com/Thunder-Group-Wire-Shelving-Clips-Sleeves-p/iss-pcs-3x20.htm
Special clips for grounding
From: http://spgusa.com/downloads/ISS_Bro.pdf