Check the listing for details. Park Tool BBT-18 8 Notch ISIS Cups / Octalink Bottom Bracket and Lockring Tool. Color: Black, Condition: New. Listed at 24.95 USD. Park Tool BBT-18 Bottom Bracket and Lockring ToolFor the installation and removal of Shimano Octalink and Bontrager ISIS Drive Bottom Bracket CupsIn Stock ● Fast Free Shipping ● Authorized Park Tool DealerFast Same Day ShippingEven on Saturday 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 wrenchFits the following:Shimano® Octalink® right side bottom bracket cup with external notchesBontrager® ISIS Drive™ bottom bracket cupsFront chainring lockring for Bosch® Gen 3 and Gen 4 e-bike systems and Specialized® Levo® Brose® e-bike systems