This weight distributing system is designed with tapered spring bars for a softer ride. Friction material, used for sway control, provides a quiet ride. Wide spring bars, with a simple pin and clip assembly, reduce wear in the head and on the friction pads. STEADi-FLEX® Heavy Duty Weight Distributing Kit includes shank, built in friction sway control and hardware. No drill installationWill fit 6" frames w/bottom mount couplersHitch bar includedIntegrated sway controlLimited lifetime warranty