From a novice to an expert in trailer repair, make life easy with the pre-greased easy to install trailer hub and drum from Dexter. The experts at Dexter Axle have already prepared the hub and drum to go on the trailer spindle smoothly. Don't worry about where the seal, inner, and outer bearings go, it is already done for you with the exact amount of grease you need to run the trailer axle properly. The kit comes with all the part you need to complete the installation no matter what type of spindle you have and to make installation easier the hub and drum comes with easy-to-read instructions. Pre-Greased 5 on 4-1/2" Hub-Drum. For 3.5K axle, 5-4.5- BC, studded, 1/2"-20, 1.718" seal, greased with bearings, & E-Z Lube Grease Caps. Bearings and seal come installed & pre-greased. They also included E-Z Lube & standard grease caps, spindle attachment hardware & lug nuts.