This high profile trumpet flash collar is for a pole with a 3" diameter, it is made from aluminum and has a .060" wall thickness. This one has an outside diameter of 10" and a height of 2 3/4". Trumpet collars are generally used with flagpoles where a shoe base is welded to the bottom. These collars can be used on a standard in ground mount as well if a higher profile is desired.These provide the finishing touch to the botton of your flagpole, covering up the cement used to install your flagpole. Split flash collars are usually used to replace existing flash collars because the pole does not need to be removed. Available in 5 finshes.