This black C-Thru Folding Parallel Rule, Model 1500-12 is a must-have for any collector of science and medicine equipment. Made in the United States, this rule is perfect for engineering and drafting tools. Its unique design allows for easy storage and transportation, making it a great addition to any collection. The brand, C-Thru, is well-known for its quality and durability, making this rule a reliable choice for any project. Whether you're a collector or an engineer, this C-Thru Folding Parallel Rule is a great addition to your collection.