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1. Sturdy, lightweight and easy to handle 2. Extender with Center wheel allows for expanding to 23" diameter, 11.5" radius 3. Direct view of vertices allows more accurate constructions 4. Ruling pen suits for engineering drawing 5. Replacing head 6. Micro-set center wheel for easy adjustment 7. Geometry tools set, especial suitable for school teaching use, engineering drawing, sketch geometric graph Specifications: 1. Material: Iron 2. Color: Silver 3. Overall Length: 6.10 "/ 15.5 cm 4. Weight: 100 g / 3.52 oz 5. Package Included: Transparent box + compass stand + 2 ruling pen + extender + replacing head + Refill