This amazing auto knife represents the influence of original Italian "Stilletto" style auto knife and Pro-Tech's modern coil spring precision. It has a 4" satin blade and features T6-6061 aluminum handles that are machined from solid black stock. The blade is 154-CM stainless steel and is heat treated to 59RC. This model has a black handle with carbon fiber inlays on the handle. Blade: 154-CM Stainless Steel, 4" Long Blade, .125" thick, 59RC Handle: T6-6061 Anodized Aluminum, carbon fiber inlay, .485" thick Open Overall Length: 9.6" Closed Overall Length: 5.56" Weight: 4.0 ounces