Double-sided bottom bracket lockring hook spanner. One side is a single hook the other is a hook spanner with 3 notches for better engagement in the lockrings. The three-hook end will fit 3-notch lockrings with a maximum outside diameter of 46mm and minor diameter (in the notches) of 40mm.
NOTE:;The HCW-5 is designed for bottom bracket lockrings. For fixed gear lockrings use the;HCW-17.