This Blundell Harling 350mm Angle-Line Adjustable Set Square is an excellent-value adjustable drawing square made to the same standards of accuracy as more expensive models. The body is made from shatter-resistant acrylic, with stainless steel and brass pivots and fastenings. The Blundell Harling 300mm and 250 Angle-Line Adjustable Set Square is a tool for anyone needing to produce accurate drawings, especially architects, engineers, designers and students.