The GAGE BLK SET 36PC RECT AS-1 ST by Field Tool Supply is a premium set of rectangular gage blocks, perfect for precision measurement tasks. This set includes 36 blocks made from high-grade steel, ensuring durability and accuracy. Each block is finished to meet strict flatness tolerances, making them ideal for calibration and inspection purposes. The varying dimensions provide flexibility for different applications, whether in machining or quality control. This set is essential for professionals seeking reliable measurement tools.