Set a heavier 2" OD railing post to the floor with the base parts engineered to work together. The tube slides into the steel insert, the cut flange bolts down and carries the post, and the canopy slips over to hide the flange and bolt heads. It's the full base for a post at the head of a wide stair, along a balcony edge, or where an atrium rail starts. The parts are 304-grade stainless steel in polished or satin to match your rail. Tubing runs at.050" wall. 304 stainless is right for indoor and light-outdoor use, so avoid marine and coastal exposure. A spec sheet is available for engineering and code-compliance documentation.