10" Adjustable Trailer Drop Ball Mount Hitch Pro Auto Adjustable 10 Drop Ball Mount Specification *" Raises Or Lowers Hitch Ball To Proper Level *Length: 13-1/4 *Hitch Ball" Hole: 1 *4 Level of Raise: 4-1/2"" To 10-1/2 1 Reducer Bushing: 1" OD To 3/4" ID"