Description This siding light mounting block simplifies outdoor light installation , blending durability and ease of use . Made of tough plastic , it resists cold , frost and crack Key Feature Installation takes 4 simple steps , users can do it easily . It fits all siding types , including T-111 , so it works for most homes Specification Name: Siding Mounting Block Material: Plastic Size: 16.2x16.2x3.3cm/6.48x6.48x1.32 inches Small diameter: 2.15cm/0.86inch, Large diameter: 10.1cm/4.06inch Style(optional): 2 Set, 4 Set Note 1. There may be slight differences between the picture and the actual color of the commodity. We will try our best to show you the exact color 2. Please allow slight dimension difference due to manual measurement