Made from round 4130 chromoly steel tubing with a natural finish, Has a 1.63" O.D. and a 0.083" wall thickness, They are sold in pre-cut tube lengths of 3, 7 or 10 feet to better suit your needs, Ideal for use in roll cages, race car chassis, roll bars, bumpers, nerf bars, etc., Uses include roll cages, race car chassis, roll bars, bumpers, nerf bars, etc.