5" base with 7/16" holes. Holes can be used to secure to surface using tent nails, rebar, etc.Can also be used for umbrella stand or flag stand. We carry a very complete line of 3/4", 1", 1 3/8" & 1 5/8" Canopy fittings. We also carry a huge inventory of Solid poly tarps and Mesh shade tarps in many colors and sizes. In 6", 9", 11" & 13" are also available in different styles and colors. We do carry grommet kits and punches if additional holes are needed, pipe cutters if you need to change the length of your pipe and a small line of tools. This is a NEW IMPORT Item (#942). This item is in the category "Home & Garden\Yard, Garden & Outdoor Living\Garden Structures & Shade\Other Structures & Shade". The seller is "buys4u" and is located in this country: US. This item can be shipped worldwide.