The Springfield KingPin Pedestal System is designed for secure placement and simple removal. This base works with the unique KingPin System and fits the standard 3/4" E-coated steel pin that extends from the bottom of the pedestal. The standard pin with a high-strength composite clip is designed to prevent unintentional detachment. The Square Steel Base For Standard KingPin Post is stainless steel with a satin finish. Below the deck mount requires a 2.5" dia. hole in deck. Measures 7" x 7" with a 3" deep cup. 7" x 7" square | KingPin Square Steel Base For Standard Pin Post, 7" x 7"