This Blue Ox fifth wheel hitch attaches to a 2-5/16 inch gooseneck hitch ball. Specifications•Gross Trailer Weight: 21000 Pound•Gross Pin Weight: 5000 Pound•Mount Type: Sliding•Vertical Height Adjustment: 17 To 19 Inch•Pivot Type: 2-Way•Color/ Finish: Black Powder Coated•With Mounting Hardware: Yes•Drilling Required: No•Cutting Required: No•Material: Steel•Lock Position: Handle•Estimated Install Time (Hours):2 Dual Articulating Head: Front & Back, Side-To-Side Adjustable Height From 17 To 19 Inch Lightweight & Two Piece Design | Blue Ox 5th Wheel Hitch for 2-5/16" Gooseneck Hitch Balls, 21K