Today we're going to be taking a look at the BMW trailer hitch receiver lock for 2 inch hitches, part #BWTS51234. This stainless steel lock is perfect for keeping your BMW ball mounts safe or protecting any other hitch mounted accessories. It's a 5/8 pin that's going to work for 2 inch by 2 inch receivers. The tube key and the cylinder lock provide better security because they're harder to pick… see more >