Item Type: Calendar Spring Material: Alloy Product Size: Approx. 4mm / 0.2in (Manual Measurement, There is a Little Error) Product Color: Silver Purpose: Watch Movement Replacement Model: 2000-1/2576 Package List 1 x Calendar Spring 1[Easy to Use] Simple to operate and easy to use, this exquisite watch accessory is an excellent choice for watch repair. 2[Durable] Using sophisticated production technology, is strong, durable, not easy to deform, not easy to damage. 3[Material] Made of high quality alloy material, has oxidation resistance, rust resistance, long service life. 4[Small Portable] The watch accessory is small and portable, convenient to store and carry, and convenient to transport at the same time. 5[Use] Can be used to replace the watch movement and is a professional tool for watchmakers and watch repairers.