The SQS-CENTER is a heavy-duty caster plate that goes in the middle to reinforce your base you just need to slide it in and place it at the measure you want.
The plate is designed so you are able to put different wheels size on it 4, 5, or even 6 inches and those items:
For your structure, you still are in need to use normal pipes. You can use the P-96-BL for regular use or EP-96-BK for ESD application.
A Flexpipe Product
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/.