The HFS (R) Steel Parallel Set is an essential tool for machinists, offering high accuracy and reliable performance. Each set contains 10 pairs of parallel sets, with each pair having a specific height listed, ranging from 1/2" to 1-5/8". The parallel sets are made from high-quality tool steel, stress-relieved against distortion, and precision ground and hardened for enhanced durability and accuracy. With two holes in each parallel set, they are designed for easy handling and maneuverability. All the parallel sets in the set are 6" long and 1/8" wide or thick, making them compatible with various machining applications. The parallel sets provide an accuracy of +/- 0.0002" in parallelism, ensuring precise and consistent measurements. Additionally, each pair of parallel sets is paired with a height accuracy of +/- 0.0002" for added precision and versatility.