The GAGE BLK SET 81PC RECT AS-0 TC from Field Tool Supply is a comprehensive collection of rectangular gage blocks, perfect for precision measurement applications. This set includes 81 pieces, crafted from high-grade steel to ensure durability and accuracy. Each block is designed to meet stringent industry standards, providing reliable flatness and dimensional accuracy. With a variety of sizes included, this set is ideal for calibration, inspection, and machining tasks. Whether you're a professional engineer or a machinist, this gage block set is essential for achieving precise measurements in your work.