The BBT-19 is a heavy duty shop quality tool for installing & removing Shimano Race Face FSA Campagnolo & Truvativ sixteen-notch external bearing bottom bracket cups Made from investment cast steel the BBT-19 can be turned with a 3/8 inch drive torque wrench 3/8 inch ratchet driver 1 inch wrench or FRW-1 Freewheel Remover Wrench