The GAGE BLK SET 81PC RECT B EC from Field Tool Supply is a versatile set of rectangular gage blocks designed for precision measurement. This set includes 81 pieces, each made from high-quality steel to ensure durability and accuracy. The blocks are engineered to meet strict industry standards, providing reliable flatness and dimensional accuracy. With various sizes available, this set is perfect for calibration, inspection, and machining tasks. Ideal for professionals in engineering and manufacturing, this gage block set is essential for achieving precise measurements in any project.