Assortment as described, be sure to observe the specified diameters and lengths. found the sizes and range useful for my prototyping. I made the part out of aluminum first because it's the easiest to machine. I then modified it as needed and when satisfied created the final part from the stainless bar. That was enough to know I could order a long pole for economies of scale. The rods are enough to use without spending a lot of money on some rods that you might not use for a long time.