Protech TR-4.62 Limited Edition Bruce Shaw Skull Automatic Knife black blade. 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.