Park Tool BBT-35-36 Bottom Bracket Tool Description: The Park Tool BBT-35-36 is a precision CNC-machined aluminum tool for the installation and removal of select bottom brackets with 36-notch tool fittings, including Praxis Works M35. Anodized for easy identification and features a ratchet/torque wrench-compatible 3/8" drive. Features: Heavy duty shop quality bottom bracket tool A precision CNC-machined aluminum tool for the installation and removal of select threaded bottom brackets with 36-notch Compatible with Praxis M35 model and Box Two Oversized M35 Fits 36-notch bottom bracket tool fittings with a major diameter of 51-53mm and a minor diameter of 50.7mm 3/8" drive compatibility