K&S Brass Round Tube Stock, 5/16 In. O.D. x 1 Ft. is a versatile and commonly used material i for a wide range of projects. This brass tube is favored by craftsmen, handymen, machinists, hobbyists, and modelers for its reliability and ease of use. Whether you are working on detailed models or precision mechanical parts, this brass round tube provides excellent quality and performance. Model Number: 8133