"Fits Models: Smith & Wesson J-Frame... Airlite, Airweight, Bodyguard, Chiefs Special, Centennial, Ladysmith, models 36, 37, 38, 49, 60, 63, 317, 331, 332, 337, 340, 342, 351, 360, 442, 637, 638, 640, 642, 649, 651 and 940 with round-butt J-Frame. The folks at Smith & Wesson are so taken with the quality and reliable performance of Crimson Trace, many of their handguns now come standard with factory installed Lasergrips laser sights, complete with the famous S&W logo. We make more laser sights for Smith & Wesson handguns than for any other firearm manufacturer. Compact Lasergrips For J-Frame Revolvers..... The LG-405 LaserGrips are our latest edition for the prolific Smith & Wesson line of J-Frame Revolvers (Round Butt). They are our most comfortable revolver LaserGrips to date, and feature a recoil reduction pocket to improve control of the smaller Smith & Wesson frame.|Activation: Instinctive Activation; Front.|Material: Comfortable Rubber Overmold.|User Adjustable: Both Windage and Elevation.|Master On/Off Switch: Yes.|Warranty: 3 Years Complete.|Beam Intensity: 5mw peak, 633nm, class IIIa laser. Maximum output that federal law and technology allow.|Dot Size: Approximately 0.5" diameter at 50 feet.|Power Source: Two #2032 lithium batteries (included); over four hours of on-time use and a five year shelf life.|Export of this product outside of the United States of America is not allowed and is controlled by the US Department of State"