The single shaft pre-drilled stanchion mounting plate is commonly used with the aluminum tube profile to create an offset axis. The tube connects perpendicular to the mounted base to form the stanchion. The plate is aluminum, making it a strong and durable option. Clamp screws are included. The suggested hardware to mount the base to a T-slot can be found on the "Suggested Hardware" tab.
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/.