Review on CURT 25330 Channel-Mount Adjustable Trailer Coupler: 2-5/16-Inch Hitch Ball, 14,000 lbs, Black - Ultimate Towing Versatility by Jody Kashani

Easy to install, holes match perfectly, fits perfectly in my 3" channel. I had to do a little persuading as the snapped spigot coupling bent the channel slightly. Quick installation with pneumatic impact wrench. It would probably be possible to use an impact drill like Dewalt, but this would require a suitably deep head. All in all a great deal and a good product. Grabs the ball easily.