This is the sharpest, strongest, replacement razor-blade knife available, with blades that change safely and easily at the push of a button. The black-oxide coated blade holder supports the razor-blade for the strength of a standard knife and sharpness of a surgeon s scalpel. The 3.5 Japanese 420J2 stainless razor-blades are precisely heat treated and hand finished shaving-sharp. The double molded Grivory handle features rubberized TPR inserts for a non-slip grip, even when wet. The double sided thumb stud allows easy, one-hand opening and the replaceable pocket clip contours with the handle so it feels like an integral part of the grip. Comes complete with six replacement blades. Knife Blade: 3.5 / 8.9 cm Overall: 8.0 / 20.3 cm Razor-Blade Steel: Japanese 420J2 Stainless Razor-Blade Thickness: 0.6mm Handle: Grivory with TPR inserts