The wide horizontal stanchion base commonly used with the aluminum tube profile to create an additional axis. The tube extends parallel from both sides of the mounted base. It is a wider option, making it sturdy and durable. 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/.