The BBT-69 is a precision machined aluminium tool for the installation & removal of 16-notch external bearing bottom brackets with an outside diameter of 44 mm The BBT-69 fits &40;BB80 BB5700 XT BB70 BB51 & previous models&41; Campagnolo Chris King FSA Mega Exo Hope SRAMÂ/ Truvativ GXP Race Face X-type Surly Wheels Mfg & others 3/8 inch ratchet/torque wrench drive compatible Made in the USA & covered by Park Tools legendary limited lifetime warranty