The Blue Ox BXW4041 TrackPro Spring Bar Kit is designed for use with the TrackPro Weight Distribution Hitches. These tapered spring steel bars augment the suspension of the trailer and the tow vehicle, providing a smooth ride. They feature a maximum tongue weight of 1,000 lbs. Attach the springs bars to the L-brackets and go. Backup without disconnecting. L-Brackets are sold separately. Powder coat finish aids in rust prevention and prolongs the life of the product.