Pedros shimano 8 notch bottom bracket wrench fits 8 notch shimano octalink and isis drive bottom bracket cupspedros bottom bracket flat wrenches are made from 4mm thick precision laser cut heat treated tool steel for the ultimate in strength and long lasting performancepedros designed each flat wrench to fit perfectly protecting the component and ensuring simple and safe usage for the mechanicfeatures a single ended design with cushioned grip to provide maximum leverage comfort