Classmaster 45 Degree Set Square Clear (30 Pack) S45/30 A staple of maths lessons, these set squares have 45° angles to help draw & work out right angles & straight edges & are clear so you can still see the page while you work. 160mm in length, these set squares are supplied in a pack of 30. Set square with 45° angles Ideal for working out right angles Bevelled edge made from clear plastic for clear visibility of work 160mm in length Supplied in a pack of 30