The Smith & Wesson Model 642 is a popular and compact revolver designed for concealed carry and personal protection. Here are the details about the Smith & Wesson Model 642 in .38 Special caliber:

- Caliber: .38 Special
- Capacity: 5 rounds
- Barrel Length: 1.875 inches
- Overall Length: 6.3 inches
- Weight: 15 ounces
- Frame Material: Aluminum alloy
- Grips: Synthetic grip
- Sights: Integral front sight and fixed rear sight
- Action: Double-action only
- Finish: Matte silver or black finish

The Smith & Wesson Model 642 is known for its lightweight construction, small size, and reliability. It features a snag-free design, making it easy to draw from a concealed carry holster. The .38 Special caliber is a popular choice for self-defense due to its effectiveness and manageable recoil.

If you have any more specific questions or need additional information about the Smith & Wesson Model 642, feel free to ask!