This Perko 15" Lucite Parallel Rule is a must-have for any collector or enthusiast of engineering and drafting tools. Crafted with precision and care, this parallel rule is a testament to the craftsmanship of the past. Its clear Lucite material ensures accuracy and ease of use, making it a reliable tool for any project. Perfect for both personal and professional use, this parallel rule is sure to impress and assist in all your drafting needs.