This Heinie sight set for Glock Pistols features their rear Ledge design. The military inspired sight design combines the best features of their Classic and SlantPro with a few of its own that sets it apart from your target or EDC sight. Equipped with a wide square notch for quick acquisition of the front sight, the rear face slants forward and is serrated with contoured edges (so it can be carried everyday without worry of snagging). The Ledge was designed with a lip that allows the operator to cycle the slide with one hand easily, giving you the advantage in any situation. The legendary Straight Eight night sight system puts this set over the top as a must have.& Mfg: Heinie SPECS: Steel, matte blue finish. Tritium inserts - Green. Rear Sight: .125" (3.1mm) x .112" (2.8mm) notch. Other dimensions vary depending on model. Front sight heights vary to regulate properly with rear sight. Glock/Glock Ledge - Rear Sight: .250" high, .156" wide notc