The Stanley 1912 Combination Square is a professional-grade measuring and marking tool featuring a robust cast iron stock for superior durability. This versatile 300mm (12in) square is equipped with a high-quality steel rule that is precision-etched with graduations on both sides in mm, 8ths, and 16ths. It features a precision-machined face for improved accuracy and can be used as a try square, mitre square, depth gauge, or steel rule. A built-in 360° vial is integrated into the stock for horizontal and vertical leveling tasks. Benefits Heavy-duty cast iron stock provides increased weight and stability for professional use Class 1 accuracy on the steel rule ensures precise measurements for critical tasks Multi-functional design: use as a try square, mitre square, depth gauge, or level Precision-machined on all faces for consistent geometric accuracy High-visibility etched graduations for long-lasting readability Good to know Blade length: 300mm (12in) Includes a built-in scriber located in the base of the stock for convenient marking Features a 360° all-round visibility vial for quick leveling checks The blade is fitted with a secure knurled nut for easy adjustment and locking Regularly clean the steel rule and stock to maintain smooth sliding action and prevent corrosion