This is the aluminum version of Felix Ure's excellent Titan puzzle. Functionality is the exact same as the brass version.
Titan is a simple-looking, yet highly challenging take-apart puzzle. The first design by Felix Ure, it's widely regarded as being both incredibly difficult and very satisfying to solve. The goal is to open the sphere but to do so you must defeat the mechanism which keeps the two spheres together.
Machined from solid aluminum, Titan measures 2 inches (50mm) in diameter and weighs 515g or approximately one lb.