These large surface mount covers are for tables or benches that use 2 7/8" tubing for legs. Purchased as a set of two covers. Four legged tables require 2 sets. These powder coated aluminum covers can only be ordered at the time a table or bench is ordered. They are used to cover up the surface mount attachment for the legs on our 'Web' Style picnic tables and on some benches that use 2 7/8" diameter legs. The price includes 2 covers. When adding to a picnic table order, add two sets.