CNC machined from pure carbon steel and ready to install in your favorite Lo Mount Novak style rear sight cut. These sights were designed to flow with the lines of your slide and cover the entire dovetail while narrowing to the width of the cut in the rear. Top Hat Satin blued finish and tastefully beveled edges complete this package. Available in BOTH .140" wide U Notch and .140" wide Square Notch. The blade is far too thin to accommodate tritium inserts. Minor fitting may be required. This sight is engineered to blend with the top radius of your slide perfectly, provided that the sight cut was cut to proper depth.