BTI Tools Schrade Viper Gen 3 OTF Assist Double Edge Black Blade - SCHOTF3CB.pbrbrSchrade brand knives have so many models - but they are cleverly designed, well made and really economical. These Out-the-Front openers are super fast and well made. They have a safety on the side and the mechanism takes a little getting used to, but they are truly awesome and impressive. The 3rd Generation Out the Front Assist model is no exception. It's got a 3.5" double edge spear point blade, tough aluminum handles, and a locking safety mechanism. Specifications Blade Length: 3.5" (8.9 centimeter) Closed Length: 5.3" (13.5 centimeter) Blade Steel: 4034 Stainless Steel, Black Handle Material: Aluminum Window Breaker Tip Blade Lock and Side Safety Deep Carry Pocket Clip Weight: 4.9 ounce.