The Klein 44005 Lightweight Lock back Knife features a 2-5/8-Inch sheep foot blade. The blade is constructed of AUS 8 stainless-steel that is hardened to 58-59 Rc. The premium quality blade offers superior edge holding and an impact-resistant 4-1/8-Inch nylon resin handle with rubber insert. The 44005 knife incorporates a thumb stud (reversible) provides easy one-handed opening. Since 1857, Klein Tools has manufactured the world’s finest hand tools.