WORRY-FREE: LIT-PaTH's fixtures have been produced in a factory with over 40 years’ experience producing light fixtures for leading brands throughout the world. They are built to last with reliable quality and a great mix of decorative and functional features like brass fixture mounting screws and a high quality powder coat finish. Please feel free to contact us for the support if you need any technical help. STANDARD SIZE: 3.1 inch fits standard post light in USA. Please kindly note that the base is not used for pole but for match post light. DURABLE USAGE: Material: Aluminum which is rust-proof. DIY INSTALLATION: Easy to install, Parts and Instruction can be found in the package. BASE SIZE: 5.8*5.8*3.4 inch with with 3.1 inch diameter short pole to fit post light. LIT-PaTH Outdoor Post Light Mounting Base, Pier Mount Base with Matte Black Finish, 2-Pack