Smith & Wesson J-Frame revolver is designed to fire a full power round and is as simple and easy to use as it is reliable. The Model 640 is based on Model 40 Centennial. It is a small frame concealed hammer revolver which integrates the time-tested features of the original with modern advancements and competition specifications and features. This model has stainless steel diamond-tipped machine tool scroll engraving frame, cylinder, and barrel. It also has blade front and fixed rear sights, enclosed hammer, and engraved wood grips. Included is a wooden mahogany presentation case.