Review on Motormic Trailer Hitch Lock - 5/8" Extra Long Black Pin with One Locking System - Includes 1 Safety Clip and 5 Anti-Rattle O-Rings - Fits 2" and 2.5" Tow Receivers (Class III, IV, V) by Dwayne Pore

I'm a little disappointed that the fuser head wobbles a bit. I've read horror stories about locks bouncing and causing the ball stem to detach from the hitch. They do have a backup pin, albeit slightly as a backup, so hopefully that's not an issue. My old curved post is very narrow but this one goes straight in. With my calipers they are 1/64" smaller than the 5/8" or 39/64" diameters. actually more for protection from cell phone drivers and the occasional light trailer towing.