Proper size:these machinist squares rules are include 2 inch , 3 inch , 4 inch and 6 inch squares, The proper size the accuracy of the measurement data, also allow you to hold the rule easily and firmly work performance: the testing machinist square can be applied to various engineering measurements, it can accurately measure the vertical deviation of internal and external angles; The accurate 90 degree angle has no difference, assuring the measurement data correct without error Easy to identify: You can quickly identify the data to that you can easily measure each right angle, highly accurate setup and layout work, all have the same beam and blade width and thickness, which makes it possible to use them in combination craftsmanship: our machinist square has bright color and smooth base , as well as quality material; Without trace, it let you have a and comfortable use experience Safe and reliable: this square tool use rivet links design, so it not endanger your safety; Besides, its chassis is heavy, upright and stable, as well as not inclined, so the measurement data is more accurate and easy to read., Manufacturer: CTRLZS