Material: Stainless Steel Color: Silver Quantity: 1 Pack Bottom bracket lockring wrench is designed for bottom bracket lockring to help tighten the lockring and adjust the bearing precisely. It has a single hook on one side that will fit most locking rings with an outer diameter of 43 to 46 mm. The other side triple hook end fits a 3 notch locking ring with a maximum outer diameter of 46mm and a minor diameter (in the notches) of 40mm. The flat design makes the bottom bracket wrench lighter and more convenient to carry and use. Made of stainless steel, rust proof and corrosion resistant, and can be used in various harsh scenarios without maintenance.