The installation is simple and convenient, and can easily help you replace the old or broken one. Exquisite workmanship, precise and practical, stable performance, is a very good automatic watch movement. It can be easily replaced, so you can better perform watch repair work. It has a wide range of uses and is very suitable for the daily maintenance and replacement of watch repairers, watchmakers and users. Material:Metal Model: 2001 Radiation tune up the pendulum Movement size: diameter 27mm thickness 5.96mm color: silver Package Contents: 1 x Movement Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.