TAC Force TF-637 Series Assisted Opening Folding Knife, Black Half-Serrated Blade, 4-1/2-Inch Closed Spring assist folding knife offers rapid one-handed deployment, locks securely into place with liner lock Black half-serrated stainless steel blade Aluminum handle with wood overlay; seat belt cutter and glass breaker for emergencies Comes complete with a pocket clip for easy and safe carry 4-1/2-inch closed length, 3-1/4-inch blade length with 3mm thickness