This 32-in ”Ecospike” model spike is designed to support light work like fences under 60-in, post boxes and light signs. It is made for square 4-in x 4-in post, with inside measurement of 3 1/2-in x 3 1/2-in. This spike delivers a solution which is efficient and economical, which does not require digging or pouring concrete. Its black powder coated, and baked finish and its steel structure combine style and durability for years to come.