The GAGE BLK SET 81PC SQR AS-0 ST from Field Tool Supply is an essential toolset designed for precision measurement and calibration. This comprehensive set includes 81 square gage blocks, crafted from high-quality steel for durability and accuracy. Each block is meticulously finished to ensure a flatness tolerance that meets industry standards, making it ideal for machinists and engineers. The dimensions of the blocks vary, providing a versatile range for various applications. This set is perfect for use in quality control, inspection, and setup tasks, ensuring that your measurements are precise and reliable.