It's a Blue Ox 8 inch drop or rise receiver used for flat towing. It has a 5000lb tow rating and has a solid steel bar that connects into your 2 inch receiver. Here is a link for Blue Ox, https://www.blueox.com/product/bx881...s-11-1-2-long/
Sells for $139 at Blue Ox or $120 at etrailer.
I'll sell it for $50 with pick up in Austin,TX area. Otherwise you pay the shipping.
I can send pictures via an email, but they are too big to attach with this app.