Top links are used on tractors to connect the implement to the tractor.There are four standard categories as follows:

This page is shows the heavy duty top links in Category 2 and 3

Category 0 socket size  16mm suit small tractors

Category 1 socket size  19mm suit medium tractors

Category 2 socket size  25.4mm suit larger tractors

Category 3 socket size  32mm suit the largest tractors