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. Dont 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 Dexter 5 on 5" Hub-Drum with 10" x 2.25" Dexter electric trailer brakes. For 3.5K axle, 5-4.5- BC, studded, 1/2"-20, 1.718" seal, greased with bearings, & E-Z Lube Grease Caps. Includes Dexter K23-026-00 & K23-027-00 Electric trailer brakes. Only works on 3,500 lbs trailer axles with four-hole brake flange. Includes mounting hardware. These are fully assembled backing plates with shoes, springs, and magnets attached and ready to be mounted. The pair includes one left hand and one right hand brake assembly. Bearings and seal come installed & pre-greased. They also included E-Z Lube & standard grease caps, spindle attachment hardware & lug nuts.