These solid billet aluminum rear lowering blocks are machined from 6061 T6 aluminum and will not snap when the U-bolts are tightened like cheap cast lowering blocks will. They come complete with 3/8” oversized grade 8 locating pins, hardware, and a special hardened drill bit for opening up locating pin hole in the leaf springs. This is a great way to get the handling and look you want at a cost that is reasonable. Heavy-duty 1/2” U-bolts can be purchased separately that will work in conjunction with lowering blocks. For use with standard 2-1/2” wide springs.