Made from CNC machined aluminum, the BBT-49 from Park Tool is for the installation and removal of 39mm 16 notch bottom brackets such as Shimano's XTR BB93 and Dura-Ace BB9000. Compatible with a 3/8" drive for use with ratchet or torque wrenches (does not feature wrench flats).
Makes it super easy to install and properly torque BB with a 38 drive torque wrench. No doubt my BB is installed 100% to spec.