Weight and weight bracket. Can be used as an alternative way to attach wheel weights to the rear of a tractor. One weight is recommended; when the weight is in the rear center it is more efficient than having the 2 outer wheel weights, so you can have less weight with more traction when attached. If you wish to add a second weight, purchase (1) 50lb weight (954040102) and additonal longer bolts. Drilling may be required see instructions for more information. Fits most tractors.