2pc 6″ Blade + Square head set. Graduation: 4R. High quality with smooth travel. Accuracy meets Federal Specifications. Hardened chrome plate blades with scratching protection & smooth slide movement. Precision lapping on all measuring surfaces. Graduations: 4R (8th, 16th, 32nd, 64th); E/M inch/metric (1mm, 64th, 32nd, 1/2mm); M Metric: (1mm, 1/2 mm, 1mm, 1/2 mm). Square, Center, Protractor with sand enamel finish. Protective case included for all 2pc / 3pc / 4pc combination square sets.