Features: Precisely engineered metal drafting compasses ensures accurately drawing, solving traditional plastic compasses deformation issues with metal plastic construction for architectural drawings and engineering drawfting. Comprehensive 23pieces set features technical rulers, ergonomic grips, and compartmentalized storage case designed for professional measurement tasks in civil engineering project. Suitable for architecture students, construction technicians, and professional architects requiring multifunctional drafting tool for precisely scale modeling and technical drawing. Optimized for drafting tables, university design labs, and construction site office where millimeter levels accuracy matters in creating structural schematics and topographic map. Combines industrial strength metal joints with light weight ABS components, maintaining drawing tool stability during prolonged use while meeting portability needs for fieldwork and classroom teaching. Specifications: Component: Metal And Plastic Color: As Picture Shown Case Size: Approx. 27x16.5cm/10.23x6.5in Weight: Approx. 350g Package Includes: 1Set Architectural Drafting Tool note: 1.Please allow 0-1cm error due to manual measurement. Be sure you donot mind before bid. 2.Due to difference between different monitors, the picture may not reflect the actual color