Vertical Holders are an excellent way to secure your flagpole to your deck or other flat surfaces. Use them at the marina or at home. Each holder is made from steel for a durable and long lasting life and comes with thumb screws. Fits flagpoles up to 1-3/8 in. dia. Flagpole not included. Maximum flag or banner size recommended is 20 square feet. The base plate is 8 in. square.