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The Ronda Swiss Made Watch Winding Stems Assortment Set in silver is a collection of high-quality metal winding stems designed for various watch Nbrands including FELSA, AS, ETA, FHF, and FEF. These stems are compatible with specific watch models such as 143 AS, 70 AS, 227 ETA, 139 AS, and 207 ETA, ensuring a precise fit and reliable performance. The assortment set provides watchmakers with the necessary components to wind and set the time accurately, making it an essential tool for maintaining and repairing watches.