Spectre's pipe plug set includes 8 threaded NPT plugs. These plugs are ideal to plug unused holes in intake manifolds, engine blocks or any location where a threaded hole is not needed. These plugs are triple chrome plated ensuring they perform as good as they look. This kit includes 2 of each in the following 4 sizes; 1/8 inch NPT, 1/4 inch NPT, 3/8 inch NPT and 1/2 inch NPT.