DIN2391 is for cold drawn ( or cold-finished) mechanical tubing possesses exceptional strength-to-weight ratios, excellent surface quality and dimensional accuracy, and is available in carbon and alloy grades to meet your varying mechanical properties. Every order we produce is custom made based on your specifications and requirements, and we offer carbon as well as alloy grades. Most popular size is 10-65mm. Tolearnce:+/-0.1, +/-0.05mm