Precision machining and setup work demands reliable tools, and this SPI 8-Piece Steel Parallel Set delivers exceptional accuracy and durability. Each set includes four pairs of parallels, measuring 6 inches in length with heights ranging from 3/4 to 1-3/16 inches and thicknesses from 1/8 to 3/8 inches. Crafted with high-quality steel and hardened to 52-58 RC, these parallels maintain their dimensional stability even under demanding workshop conditions. Perfect for machinists, toolmakers, and quality control professionals who require consistent, reliable support for workpieces during inspection, layout, or machining operations. The precision-ground surfaces ensure accurate positioning and measurement, while the robust construction guarantees years of dependable service in professional settings. This comprehensive set provides versatility for various applications, making it an essential addition to any precision measurement toolkit.