["brand new and high quality\nFeatures:\nFor checking the squareness of an edge, using the light-gap method; The blade is bevelled on both sides,30 degree edge\nSquare is true right angles both inside and outside\nBeams and blades are ground and lapped for parallelism\nMachinist square supplied in a sturdy protective for case\n1.For checking the squareness of an edge, using the light-gap method. The blade is bevelled on both sides. \n2. Accuracy grade 1, squareness tolerance of 0.02-0.05 mm. \n3. Supplied in a protective for case. \n4. Beams and blades are ground and lapped for parallelism. \n5. 30° Knife edge, beams and blades are ground and lapped.\n\nspecification:\nSize: 80x50mm/125x80mm/63x40mm\nEdge angle: 30° for Seat Width: 5mm \nAccuracy: Grade 1 \nTolerance 0.02-0.05 mm \nUse For: 90° right angle measuring, designed for precision layout and measurement work.\nColor:sliver\nMaterial:stainless steel\nQuantity:1pc\n\nNote: \nPlease allow 0-1cm error due to manual measurement. pls make sure you do not mind before you bid.\nDue to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you!\n\nPackage includes:\n1x 90 Degree Right Angle Ruler"]