Our high quality modular rig uprights are 75mm x 75mm and consist of heavy guage 3mm thick steel. Jumbo sized floor plating. Each upright comes with 4 dynabolts to secure the rig to the floor.
They come in a variety of sizes, and different sizes can be bolted together if you use the angled crossbeam.
Hole size: 26mm to suite 1inch thick (25.4mm) pin.