Features:Applicable occasions:The circle and straight line drafting set is a series of instrumental helpers involving many measurement tools that are needed in drafting and drawing work, by architects, engineers, draftsmen, builders, roofers, teachers and students, etc.These circle drawing tools for architect engineer students can be applied as daily working supplies in homes, school offices, company offices, classrooms, libraries, geometry clubs, painting rooms, and more places where there are consistent needs of geometry precision tools.Specifications:Color:as the picture showMaterial:zinc alloy steelPackage includes:7 x Math geometry toolsNotes:Manual measurement, please allow slight errors in size.The colors may exist slight difference due to different screens.