Or as low as 
Park Tool Cassette Remover BBT-5
The BBT-5/ FR-11 removes and installs all Campagnolo® cassette lockrings (including 11-speed). The BBT-5/FR11 uses a 1″ hex shape, and can be used with the FRW-1. The BBT-5/FR-11 also fits the splined 12-tooth Campagnolo® bottom bracket cups found on the square type spindle systems (Campagnolo® Record™, Chorus™, Centaur™ and Athena™ )
