Our Top Pipes are made out of high strength steel to ensure they are strong enough to support any antenna mounted to them. Pipes are hot dipped galvanized to provide long lasting corrosion protection from the elements. Our Stock sizes are 3/4 inch pipe (1 inch Outside Diameter), 2 inch pipe (2.375 inch Outside Diameter), 2-1/2 inch pipe (2.875 inch Outside Diameter), and 3-1/2 inch pipe (4 inch Outside Diameter). Standard stock size for the length of the pipe is 4 feet. We can make any diameter or length of pipe to meet your individual needs upon request. All Top Pipes come with a flange and lightning rod tab welded on.