2.5" Class V Hitch Adapter for 2" hitch racks Fits all Hollywood 2" hitch racks (both "No Wobble" and threaded hitch pin) Fits other brands of 2" hitch racks that use threaded hitch pins Slides over 2" hitch, held in place with two set screws Includes 3/16" (5mm) allen wrench When using with the RV Rider, you will need to purchase a 2.5" Hitch Tightener This product is intended for use with bike racks only, for use with 2.5: Class V hitches only Installation Installation Instructions