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.
This product is currently out of stock and unavailable.
The three-hook end will fit 3-notch lockrings with a maximum outside diameter of 46mm, and minor diameter (in the notches) of 40mm.
The HCW-5 is designed for bottom bracket lockrings.