This product changes the standard leveling screws (1/2" diameter) to the large leveling screws (5/8" diameter) on Large Size and HEAVY DUTY Medium Size Universal Wheeley Bars which normally come with the smaller screws.
(NOTE: Large leveling screws come standard on Extra Large Size and MAX Size Universal Wheeley Bars. If you wish to use the large leveling screws on the standard Medium Size Universal Wheeley Bars due to excessive total weight then you should consider purchasing the HEAVY DUTY Medium Size Wheeley Bars.)
If you simply wish to purchase the Wheeley Bars with the large leveling screws, pick the "upgrade at time of purchase" option. With this option the larger bolt is welded to the leg.