CURT 40099 Chrome European Trailer Hitch Ball, 1,600 kg, 50mm Diameter, 3/4-Inch x 50mm Shank

This ball is basically good, however, I was surprised that there are no flat sides just below the ball for holding the ball when tightening the nut.

This is not a slotted base like the pictures. False advertisement. Will be returning.

A 50mm ball is really close in size to a US 2inch ball. The major difference is the shaft part under the ball. On euro balls it is flat, so that accessories like hitch carriers and bike racks can be tightened against it. It's hard to tell this from the pictures listed with the product, but this ball has that flat shank. If you have had a European hitch, your accessories will work with this ball.My only fault with this is that there is no place to put a wrench on this, so it's harder to tighten onto the ball mount than it could be. I had to hold it with channel locks.

this has been the biggest pain in the world, it os a 50mm ball which is awesome, but the 3/4 shank is almost impossible to fit to anything,