This high-quality T-square is perfect for sketching, drafting and more. Featuring an aluminum blade and a plastic head, it has one edge that's graduated with the first inch in 32nds, thereafter in 16ths, and an opposite edge that's marked in centimeters. Details: 24" aluminum t-square disconnected and ready for assembly 2" wide blade constructed from instrument grade aluminum attached to a durable plastic head One edge graduated with the 1st inch in 32nds, thereafter in 16ths; the other edge in centimeters Aluminum with plastic head Convenient hang hole