Spyderco Endura 4 3.80-Inch Steel Durable Blade Signature Serrated Knife (Black)The Spyderco Endura 4 Lightweight 3. 80 Inch VG 10 Steel Blade Signature Serrated Black Knife is one of the best selling folding knives ever made. All members of the Endura 4 family include a four position hook, a high strength back lock mechanism, and Trademark Circular Hole. Released in 1990, the original Spyderco Endura and its smaller counterpart, the Delica, redefined todays folding knife concept. They set a new standard as the first lightweight,