Opinel No. 10 Corkscrew KnifeThe design of Opinel's folding knives hasn't changed much since Joseph Opinel's 1890 original, and that remains with the No. 10 Corkscrew Knife. As the name suggests, it's designed for bar picnic use, with a folding 3. 92 inch stainless steel blade, a 5 turn steel corkscrew hidden on the backside of the beech wood handle, and a patented bottle opener located on the end for accessing cork less beverages.