If you're looking to enhance your Smith & Wesson pistols, then a solid first upgrade involves swapping out factory sights for a set that's built for defensive or competitive use These Trijicon Fiber Sight Sets are designed especially for most of Smith & Wesson's popular pistols. They provide a fast, durable and easily seen sighting system that aids shooters in getting on target quickly in any self-defense situation. Each Trijicon Fiber Sight Set is precisely cut to fit the dovetails found on Smith & Wesson M&P, Shield, SD9 VE and SD40 VE pistol slides and brings the same level of toughness and durability found in the company's other sighting systems to the world of fiber-optic sights. The thin front-sight blade allows for increased speed and accuracy and feature a bright-red front sight that easily catches ambient light for a bright focus point. The Trijicon Fiber Sight Set includes a rear U-notch that measures 0.125 inch wide and sits 0.307 inch above the slide. The front-sight blade width measures 0.110-inch and the front sight sits 0.138 inch above the slide. Trijicon recommends that professional gunsmiths install these sights to ensure proper sighting and retention.