Features: 1) Sturdy, lightweight and easy to handle. 2) Center wheel allows for easy micro-setting of any radius up to 3.15" 3) Direct view of vertices allows more accurate constructions 4) Micro-set center wheel for easy adjustment. 5) Geometry tools, especial suitable for school teaching use. Specifications: 1) Material: Steel 2) Color: Silver and blue 3) Case Size: 8.66" * 4.06" * 0.79" 4) Package Included: Transparent box + Silver metal compass 5 Pack + Refill Mechanical pencil for compass with 2 mm pencil lead, used for drawing circle or circular. Made from Stainless Steel and environmental plastic, durable and easy carry. Geometry tools, Ideal for math classes, drafting, architectural drawings, engineering designs, both mechanical design and construction. Case Size: 8.66 x 4.06 x 0.79inches. Package Included: Transparent box + silver metal compass 5 Pack + Refill.