A Weight Block is a attachment / accesory used on tractors fitted with front-loaders or with a front linkage. The extra weight is used to balance the machine up when working with a large mounted implements on the rear linkage or a hevey attachment or lifting large loads like bales with a tractor loader. The extra weight makes the machine more stable and als gives better traction (especialy with front loaders). Some designs have built in tool boxes or can be filled with sand or water as ballast.