Fits Smith & Wesson Airlight, Airweight, Bodyguard, Chief's 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. Round butt only. LG-105 laser sights for the wildly popular Smith & Wesson J-Frame revolver line feature a hard polymer surface that is rugged and well suited for personal defense. The smooth feel of the polymer provides for a prompt, snag-free draw. LG-105 Lasergrips includes the durability, sighting adjustments, and the defensive advantage that Crimson Trace is famous for. Beam intensity: 5Mw peak, 633nm, class IIIA laser. Maximum output that federal Law and technology allow.