These poles are made to take a beating, we thread the bottom so it screws in to the stainless steel spring so it will flex. This idea came from a Fireman named Dan of the Pasadena Fire Department. It is made from solid 316 Stainless Steel polished for a Fire Truck, and comes with our quiet composite swivels. Fits 12" x 18" flags. Spring and mounting hardware are included with this pole, it screws in to a 3/8"- 24 thread in the spring.