These sights feature the very popular Ledge style rear that is designed for quick acquisition of the front sight utilizing a wider notch width of .156. The rear face of the sight is serrated and has enough material to catch on your belt, boot, jean seam...any surface available in an emergency for one-handed clearance drills! In addition this sight set is equipped with the legendary Heinie Straight Eight night sight system. This is a must-have modification for your carry pistol! This sight set does not require modifications to the slide. The "Straight Eight" configuration is one tritium dot in the front and one tritium dot in the rear that aligns vertically for fast acquis Mfg: Heinie