The Sea-Dog Adjustable Rail Mount Flagpole is made of highly polished, heavy wall stainless steel tubing. The flag is attached to the flagpole using nylon penant mounts with stainless steel spring wire quick release clips which are designed to hold their shape after continued use. Both penant mounts can move either direction on the flagpoles allowing flexibility in mounting various sizes of flags where the eyelets of the flag are less than the overall length of the flagpole. Models 327122-1 and 327124-1 incorporate a rail mount flagpole holder for the 17" and 30" flagpoles that can attach to either 7/8" or 1" tubing.NOTE: See chart for additional information.