Protechs TR (tactical response) knives are all business. The Protech TR series of knives are all made of the highest quality materials available, manufactured and assembled painstakingly to produce a factory production knife with the tolerances of a custom made knife costing hundreds more. Rest assured that your Protech Tr knife will rise to any challenge put before it. As with all Protech Knives, the TR series carries a limited lifetime warranty and Dave, the founder and owner of Protech Knives, personally stands behind every Protech knife made.Specs: Overall Length: 8", Blade Length: 3.5", Blade Thickness: .125", Closed Length: 4.5", Weight: 3.6 oz. Tip down carry.