-The heavy square base ensures stability and precision -Right angle,the measurement data is more accurate -All dimensions are measured manually and there may be small deviations -The compact sizes makes storing Machinist Square Set a breeze -The Steel Angle Ruler is is thicken,erect and stable,not easy to tilt,easy to measure each right angle, Weight: 0.2755778275 Pounds, Manufacturer: Ngbbby_E61_1033704