Description:Adopting premium metal construction, anti-rust and stable. Adjustable, crown winder fits most watch crown, winding your mechanical watch easily and fast.There are 4 different size, you can get suitable one. Can be used when letting down mainspring when working on mechanical watches. Easy and handy to take with you because its small size and light weight.Specifications:Material: MetalColor: Shown As PicturesLength: Approx. 8cm / 3.1inchOptionalCaliber: 3mm / 0.1inch, 3.5mm / 0.1inch, 4mm / 0.2inch, 4.5mm / 0.2inchWeight: 27 - 28gType: Tools & Repair KitsFunction: Repair Watch, etcPackage Includes:1 x Watch Crown WinderNote:Please note that new type and old type of this product will be sent randomly, and make sure you will not mind before ordering.