The innovative Pro Series™ Trunnion weight distribution is engineered to provide the features you expect in a weight distribution kit at an economical price. Available in 600, 800, and 1,200 lb. Tongue Weight Models •New combination single piece cast head •Easy to use adjusting washers •Unique washer design allows for quick spring bar tension adjustment •Round tapered spring bars •Head is compatible with two Friction Sway Control (each side) •Includes weight distributing shank #63970 •10 year limited warranty