These are Zinc Coated Grade 8 flanged replacement bolts for your lower shock mounts. The most common use for these is to elimate the "radflo clunk" which is caused by the tapered factory lower shock bolt.
Cost is per pair
Note: The "Radflo clunk" gone unchecked can permantly widen the bolt holes on your lower control arms. If your bolt holes are deformed, these bolts will likely not fix your noise unless you also fix your lower arms as well