Park Tool BBT-18 8 Notch ISIS Cups / Octalink Bottom Bracket and Lockring Tool

Specs: 

• The BBT-18 has 8 notches with an outside diameter of nominally 43.4 mm
• The inside-to-inside width is approximately 38 mm
• Each notch is approximately 3.9 mm wide
• The hole in the center of the casting is 22.5 mm and will not fit over the 30 mm spindles
• Can be used with a 36 mm crow foot (such as the TWB-36) or open-ended wrench