Watch Crown Winder Tool Compatible With 3mm 0.1inch

1 Adopting premium metal construction, anti-rust and stable 2 Adjustable, the crown winder fits most watch crown, winding your mechanical watch easily and fast 3 There are 4 different size, you can get suitable one 4 Can be used when letting down the mainspring when working on mechanical watches 5 Easy and handy to take with you because its small size and light weight

What's in the box
1 x Watch Crown Winder Helper