The 4 hole offset tap base plate is made of anodized aluminum to withstand daily use and wear and tear. It mounts leveling feet and threaded stem casters to a profile end or side for an added layer of strength and durability. The offset provides clearance for the threaded stem providing a greater clearance area. It requires a tap to mount to a profile end.
For technical details and images, please search for the product using the 80/20 interactive catalogue found here: https://catalogs.8020.net/80-20-Catalog-26/C/.