The Hultafors 407501 Libella L 600+900 Extension Rail Set is a high-quality measuring and layout tool made of durable aluminum. This set includes two extension rails, one measuring 24 inches in length and the other 36 inches, providing versatility and accuracy in various leveling tasks. With the trusted Hultafors brand name, you can be sure of the reliability and precision of this product for your home improvement or workshop projects.