This Staedtler geometry compass delivers exceptional accuracy for students and technical drawing enthusiasts. The all-metal construction features sand-blasted, nickel-plated components and a center wheel for precise adjustments. With its universal metal adapter and hinged legs, this drafting compass creates precise circles up to 10.25". The ergonomic design includes a nonslip grooved grip and comes complete with spare 2mm lead, making it an essential back-to-school tool for advanced geometry and technical drawing classes. High quality: with roots tracing back to the 17th century, Staedtler emphasizes tradition, innovation, and inspiring creativity for artists, students, and professionals worldwide. Staedtler is for its high-quality writing, drawing, and creative products, including iconic pencils like the Mars Lumograph, colored pencils, markers, and modeling clays (FIMO).Details:Blue and silver compass with lead refillMeasures 13.8" (35 cm)This drafting compass creates precise circles up to 10.25" (260 mm)Metal constructionAdvanced compass: Staedtler geometry compass delivers exceptional accuracy for students and technical drawing enthusiasts quick draw: center wheel for quick settingEasy to store: The hinged legs allow for a variety of measurements and compact storageExtended measurements: included plastic leg extensions to use as neededPrecise drawing: equipped with a high-quality, universal metal adapter for easy circle-drawing