The Flash Collar for Shoe-base Flagpole is a Classic style collar for outdoor flag pole installation which stands 5-5/8 in. tall. Remember on ground installations, that the outside diameter of the collar should be at least 1 in. larger than the diameter of the foundation sleeve and the I.D. of the collar will be approximately 1/8 in. larger than the shaft. Diameter listed. At installation, this space should be sealed to prevent water from entering the ground sleeve. Not available in cast aluminum.