1、Compatible Models: Watch mainspring winder is suitable for various watch models including 9015/1847/899/2135/1904‑1/3120/2450/240/L888/1904‑2/brass making it an essential tool for DIY watchmaking. 2、Ergonomic Handle: With its handle designed according to human engineering norms, the Watch Mainspring Winder ensures a metallic touch, non slip grip, and easy handling, improving work efficiency. 3、Ideal for Professionals: Watch winding tool kit is indispensable for watch repairers, watchmakers, jewelers, or amateur enthusiasts. Its excellent quality material guarantees maximum durability. 4、Excellent Quality Material: Crafted from wear resistant and sturdy brass, this mainspring winder is a reliable and practical choice for any watchmaker. Resistant to damage, practical and reliable. 5、Convenient and Portable: Comes in a storage box, making it easy to find and store different models. The whole set is simple to retrieve and carry, enhancing user convenience. Item Type: Watch Mainspring Winder Set Material: Brass, Beech Wood Wooden Box Size: Approx. 23 x 10.5 x 4.2cm / 9.1 x 4.1 x 1.7in Applicable Models: for 9015/1847/899/2135/1904-1/3120/2450/240/L888/1904-2 1 x Storage Box 1 x Handle 10 x Winding Springs