Machinist Square 90 Degree Right Angle Engineer Precision Ground Hardened Ruler Details: * brand new and high quality. *For checking the squareness of an edge, using the light-gap method. The blade is bevelled on both sides. *Accuracy grade 1, squareness tolerance of 0.02-0.05 mm. *Beams and blades are ground and lapped for parallelism. *Color: Silver(As Pictures Show) *Edge angle: 30° *Seat Width: 5mm (Approx.) *Tolerance :0.02-0.05 mm *Material: Stainless steel *Use For: 90° right angle measuring, designed for precision layout and measurement work. *Optional Size: 63x40mm,80x50mm,100x63mm,125x80mm *Size (Approx.): 63x40 mm, 80x50 mm, 100x63 mm, 125x80 mm (2.48x1.57 inches, 3.15x1.97 inches, 3.94x2.48 inches, 4.92x3.15 inches) Package Contents: 1*Edge Square Ruler Note: 1. The real color of the item may be slightly different from the pictures shown on website caused by many factors such as brightness of your monitor and light brightness. 2. Please allow slight manual measurement deviation for the data. Machinist Square 90 Degree Right Angle Engineer Precision Ground Hardened Ruler 100% brand new and high cost performance. Easy to use: a suitable size and shape. Made of regular-material, more durable. In order to achieve the best results, please keep it safe before and after use.