Park Tool SPA-6 Adjustable Spanner
This spanner uses hardened, replaceable pins approximately 2.2mm in diameter. Designed for heavy duty use, the distance between the pins is adjustable, allowing use on virtually all hanger cups using pin holes.
The replaceable pins and easy adjustability on this spanner makes it the most versatile spanner I've ever used. It's also less prone to springing out of the sockets, the way the not-so-adjustable spanners are.