B&W Trailer Hitches Turnoverball One-Piece Kit Model GNRK1320B&W Trailer Hitches Turnoverball One Piece Kit Model GNRK1320 #1 selling gooseneck hitch in America. A hitch when you need it, a level bed when you don't. It's the hitch that started it all. Solid, machined 2 5 16" ball Durable powder coat finish Only a 3 1 2" hole in the bed Solid, one piece machined receiver socket provides rugged durability Flexible latch pin handle attached to a spring loaded, 5 8" steel locking pin that goes completely through