Watch Repair Tool, 3.5-5.0mm Handheld Watch Crown Winder Auxiliary Mechanical Winder

High-quality metal structure, rust-proof and stable
Adjustable, crown winder fits most crowns to wind your mechanical watch easily and quickly
There are 4 different sizes, you can get the right fit
Can be used to unwind the mainspring when working on a mechanical watch
Small size, light weight, easy to carry