Check the listing for details. Wakeboard Tower Mount Flag Holder (It Rotates). Condition: New. Listed at 39.95 USD. Tower Mount Fits towers from 15/8 to 2 ½ inch diameters.Installs easily with a Phillips screw driver. (Just put it around the tower and tighten the 2 screws with a phillips screwdriver)Has stainless steel screws so they won't rust.Tension can be adjusted.Flag is included It Rotates….Simply mount the Flag Buddy within easy reach… and rotate the ski flag up and down as required. • It’s “hands free” once you rotate it up it stay up until you rotate it down, • No need to remove the flag from the holder. • You always know where it is. • It swings down out of the wind, (No Flapping Noise) • So easy the driver can even run the flag. (Sorry..... You still have to have an observer in most states. Please check you local rules) • Works great for Swimming, Waterskiing, and Wakeboarding. I am the owner and inventor of the Flag Buddy. I stand behind my products. If you buy one and are not happy with it I'll refund your money and let you keep the flag. Thanks for looking Mike ps I also make a Window Mounted Version. (if interested email me)