Set a railing post solidly to the floor without sourcing the base pieces separately. This kit pairs a 1.5" OD steel insert the tube slides into, a cut flange that bolts down and carries the post, and a canopy that hides the flange and bolt heads. It's the whole base for a post at the foot of a staircase, along a mezzanine run, or at the start of an atrium rail. The parts are 304-grade stainless steel in polished or satin, so the finish matches the rest of your rail. Tubing runs at.050" wall. 304 stainless suits indoor and light-outdoor installs, so keep it out of marine and coastal air. A spec sheet is available for engineering and code-compliance documentation.