These sights feature the very popular Ledge style rear that is designed for quick acquistion 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 rear sight utilizes the NEW Heinie EZ-Lock mechanism that allows the sight to slide smoothly into the rear dovetail yet remain secure on your slide once installation is completed properly Mfg: Heinie