Uriah Products UW000150 Replacement Trailer Hub Kit for BT8 Spindles (4 Bolt on 4" Circle) ? 1" Inner Dia. Bearings, Black Uriah Products Replacement Trailer Wheel Hub Kit for a BT8 spindle. This is a 4 Bolt hub with the wheel bolts on a 4 inch bolt-circle. Equipped with 1/2" dia. Wheel studs, 1" inside dia. Inner and outer bearings, races are pressed into the bearing diameters. Designed for 1,250 Lb. capacity axles. Features Universal Fit for All 1 Inch Diameter Spindles Includes Bearings, Races, Seal and Wheel Nuts 1,250 LBS Capacity Hub Kit 4 bolts on a 4 Inch Diameter Bolt Circle 1/2" Inch Diameter Wheel Studs USA SHIPPING estimates delivery times and we work to get your item to you as quickly as possible and within those times, but please know it may take slightly longer than the estimate.