These mounting brackets were designed to use with the lift & lay mount to bolt it to the ladder of the RV. There is enough adjustment in these to make it level in just about any situation. Of course they can be used for other applications also. Included in this kit are 4 heavy stainless steel brackets with lots of adjustments, 4 stainless steel u-bolts and 4 stainless steel mounting bolts with all the washer and nut hardware needed.