This 10.25-Inch Knife Collapses to Just 4.5 Inches
The Collapsing Blade Mk12 sidesteps the usual relationship between blade and handle with a mechanism that expands a 4.5-inch object into a 10.25-inch knife. Its simplified construction combines titanium, spring-tempered steel, and a continuous cutting edge in something that looks ready for a science-fiction duel.