If you're looking for an outstanding tactical folding knife, here are some designs by leading manufacturers that have garnered notice. Columbia River Knives makes a CRKT Gold Plated K.I.S.S. This is a razor sharp cutting edge with an incredible 0.10" thickness. The blade is a steel AUS6M 55-57 HRC. It weighs five ounces, and is 3.5" closed.

Colt Tactical Folding Knife

The Colt Detective Special Silver Linerlock is a well-crafted weapon at a reasonable price. The Detective Special has a bead blasted blade and a lightweight aluminum handle with a textured rubber insert for sure grip. It's a reliable, sharp tactical folding knife, which measures 4 7/16" closed.

Colt's Python Linerlock knife is their state-of-the-art model, with a 440 stainless steel sandblasted blade. The Python weighs in at 10 ounces. It's a serious knife at a discount price.

For a cheap knife, don't forget the excellent Tom Cat Lockback by Frost Cutlery. This tactical folding knife has a stainless steel blade with a partly serrated edge. It's 5.25" long folded, and comes with a nylon sheath.