Precision meets durability with SPI's steel parallel set. This matched pair of parallels measures 6" long x 1-3/4" high x 1/4" thick, delivering exceptional accuracy with parallelism tolerances of 0.0003" and 0.002". Crafted from high-quality steel, these parallels are essential tools for machinists and quality control professionals who demand consistent, reliable measurements. The matched pair design ensures balanced support for workpieces during inspection, layout, or machine setup tasks. Their precise dimensions make them ideal for creating exact reference surfaces and maintaining proper alignment in various manufacturing applications. These SPI parallels (Part #13-216-7) combine professional-grade construction with exacting specifications, making them a valuable addition to any precision measurement toolkit.