The Wheeler Engineering Armour's Handgun Sight Tool makes installing, removing or adjusting dovetail front and rear pistol sights a breeze. A large adjustment wheel on the Armour's Handgun Sight Tool makes micro sight adjusts simple and easy. The Wheeler Engineering Armour's Handgun Sight Tool uses four independent positioning clamps to secure and support the slide, protecting the slide from bending during adjustments. An additional top clamp provides added security for the slide. Large, four post drive knob easily pushes the sight Reference marks for precise adjustments Works on all semi auto pistols Precision machined unit The sight prong Mfg: Wheeler Engineering