The Cold Steel OSI is the single edged version of their famous OSS. Hollow ground to a thin, ultra keen edge it's an awesome "sticker" and will cut and slash with the best of them. Specifications: Weight: 8.5 oz. Blade Thickness: 4.7 mm Blade Length: 8 1/4" Steel: Japanese AUS 8A Stainless Handle: 5 1/8" Long. Kraton® Overall: 13 3/8" Secure-Ex® Sheath Imported.