I used this to provide a warm air vent from the floor in my motorhome.  Perfect for the job, well made and strong.  Allowed me to screw it into the floor from above and then simply cover with a metalic vent to protect it.
Good quality and good value for money.

A very good product, well made and good value for money.  I used it to provide a vent in the floor in my motor home so that I could direct warm air to the front when parked and on the otorhome heating not the engine.  Worked perfectly and I am confident that it is strong enough even though it is at floor level.