PARKTOOL HCW-5 This is a Park Tool bicycle tool. It fits the lockring of cup-and-cone bottom brackets on bicycles. The single-hook side fits most lockrings with an outer diameter of 43-46mm. The three-hook side fits 3-notch type lockrings with a maximum outer diameter of 46mm and a minimum diameter (inside the notches) of 40mm. There are some minor scratches from use, but overall it's in good condition. I'm also listing several other tools for restoring old road bikes, so please take a look if you're interested. Thank you!