Park Tool BBT-135-12

Fits 12-notch threaded bottom bracket tool fittings with a major diameter (outside of notches) of 48–50 mm and a minor diameter (inside of notches) of 46.3 mm, including Praxis Works M30 57.5 mm (2.264'') outer diameter at point of engagement Internal clearance: 42 mm (1.654'') depth (from tool face) x 30.44 mm (1.198'') diameter Attributes Bottom Bracket Type 46mm/12 notch