The ProTech 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 4 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: 9.25", Blade Length: 4", Blade Thickness: .13", Closed Length: 5.25", Weight: 5.50 oz. Tip down carry. This is the Pro-Tech TR-4.59 Skull Tactical Response Automatic Knife with a Bead Blast Blade.