Park Tool Bottom Bracket/Cassette Tool for Campagnolo Fits all Campagnolo cassette lockrings Also fits Campagnolo Record, Chorus, Centaur, and Athena bottom brackets The outside diameter of the BBT-5/FR-11 is 22.8mm and has 12 splines Heat treated alloy tool steel, one inch base fits wrench or bench vise Thin wall construction allows use without removal of cones and locknuts Removes and installs all Campagnolo cassette lockrings (including 11 speed) Uses a 1" hex shape, and can be used with the FRW-1