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