Item Type: Knife Edge Ruler_x000D_Material: Stainless steel_x000D_Product Size (L x W): Approx. 100 x 63mm / 3.9 x 2.5in_x000D_Thickness: Approx. 5mm / 0.2in_x000D_Purpose: Suitable for detecting angles and marking on parts 1100x63mm square ruler, the surface is finely processed, the error is small, and the measurement is more accurate. 2The ruler body is thickened to increase the contact area with the measuring workpiece, and the measurement is more stable. 3There is milled groove in the inner corner, which can quickly remove burrs and debris and make the working surface more tidy. 4Made of high?quality stainless steel, it is rust?proof and not easy to break, and has a long service life. 5The knife?edge square is suitable for detecting angles and marking parts, and is a useful measuring tool for engineering construction.1 x Knife Edge Ruler