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[PREMIUM MATERIAL] Made of -resistant copper, this watch mainspring winder ensures long-lasting durability for professional use. [20 MODELS INCLUDED] Includes 20 different model sizes, suitable for a wide range of watch mainsprings on the market. [PRECISE DESIGN] High precision design for accurate winding, perfect for professional watch repair workers. [CONVENIENT STORAGE] Comes in a wooden box for organized storage of all accessories, making it easy to carry and use on-the-go. [SUITABLE SIZE] With dimensions of 8.1" length, 5.4" width, and 2.4" height, this winder is perfect for watch repairing.