Park HCW-6 Headset Wrench Review
This is a headset wrench made by Park. The large wrench opening is required to fit around the wrench flats on threaded headsets. This model fits 1" threaded headsets (and all 15mm pedals.)
Pros: It works. It's strong and durable.
Cons: It's not the most comforable wrench.
The Final Word
If you need to work on threaded headsets, get one of these. It's hard to find any other wrench that opens up wide enough.
Note: The HCW-9 is the proper wrench for 1 1/8" and 1 1/4" threaded headsets.