This is a steering upgrade kit to reduce friction between the spindle and axle on the listed lawn tractors. -This is a nice cheap improvement that will help reduce the effort to steer the tractor. We have been doing this for years with great success so decided to start selling them. -The kit will include 2 bearings and 4 thrust washers, each side will use 1 bearing and 2 washers. -These are premium USA Made bearings. Kit comes complete all you'll need is a little bearing grease. - -These go under the steering spindle sandwiched between the axle and steering spindle. You'll put the bearing between 2 washers with a little grease and then reassemble. -This upgrade is intended to reduce the effort to steering riding lawn and garden tractors. -It works best when all steering components are in good working order, kit is not intended to be a fix for worn steering components. -Fits the following models: D100 D105 D110 D120 D125 D130 D140 D150 D160 D170 Patent Pending