When precision matters most, reach for the CHANNELLOCK Combination Square. The square tool features a rust- and corrosion-resistant stainless steel blade and permanent laser-etched markings in 1/32 and 1/16 graduations for easy-to-read measurements that wont fade over time. Its rugged cast zinc body provides the strength and stability needed for marking, measuring, and laying out 90 and 45 angles. Plus, the square offers a built-in sliding ruler that locks securely into place for fast and secure measurements.