Sinceremetalasizes: about 63 x 40 mm Proper size: The proper size ensures the accuracy of the measurement data, also allowing you to hold the ruler easily and firmly. Fine workmanship: Bright surface color and smooth base surface, as well as quality material; without trace, it will let you have a pleasant and comfortable using experience. Nice working performance: Can be applied to different engineering measurements, it can accurately measure the vertical deviation of the inner and outer angles. The precise 90 degree angle has no difference, ensuring the measurement data is correct without error. Package Content: 1 x Wide Square SeatFeatures: Fine workmanship: Bright surface color, smooth base surface, quality material. Without trace, it will let you have a pleasant and comfortable using experience. Proper size: The proper size ensures the accuracy of the measurement data, also allowing you to hold the ruler easily and firmly. Safe and reliable: Rivet design to not endanger your safety. In addition, its chassis is heavy. Straight and stable, not tilted, so the measurement data is more accurate and easy to read. Nice working performance: Can be applied to various engineering measurements, it can accurately measure the vertical deviation. Internal and external angle; the precise 90 degree angle has no difference, ensuring the correct measurement data without error. Easy to identify: Engraved with clear dimensions and numbers, so you can quickly identify the data, making it easy for you to measure each right angle. Specifications: Type: Wide Square Seat Material: Carbon Steel Color: Silver Size(L x W): Approx. 63 x 40mm Package Included: 1 x Wide Square Seat