This Faber-Castell 12 cm technical set square is made from translucent green methacrylate and comes without graduations or bevel. It is suited to technical drawing, school use, and other precision layout tasks where a compact square is easier to handle. Reference 666-12 identifies the item in the technical series. Sold as a single piece, it is used with a ruler, pencil, or mechanical pencil for drawing clean angles and guide lines.