The SCAN deck support HD 10003-003G1 "-11 is a stainless steel 316 Heavy duty Deck support. This heavy duty deck support can be used for the installation of marine and base station antennas equipped with a 1 "-11 inch swivel system. The 1 "-11 inch swivel is not included (pn 10000-430) . This Scan deck support is made of stainless steel 316 environmentally friendly stainless steel.