craftsmanship: machinist square has bright surface color and base surface, as well as quality material; Without trace, it will let you have a and comfortable use experience Proper size:these machinist squares rules are include 2 inch , 3 inch , 4 inch and 5 inch squares, The proper size will the accuracy of the measurement data, also allow you to hold the rule and firmly work performance: the testing machinist square can be applied to engineering measurements, it can accurately measure the vertical deviation of internal and external angles; The accurate angle has no difference, assuring the measurement data without error Easy to identify: You can quickly identify the data to that you can 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 in combination Safe and : this precision square tool use links design, so it will not endanger your safety; Besides, chassis is heavy, and stable, as well as not inclined, so the measurement data is more accurate and easy to read. Material:metal colour:Silver Package Contents: 4 x Square tools Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.