Item Type: Movement Main SpringMaterial: Copper Diameter: Approx. 4.9cm / 1.93inHeight: Approx. 2cm / 0.79inUsage: Used to replace watch movement main spring .wang-edit-text{ font-family:'Arial' important; } .wang-edit-text table { border-top: 1px solid 000; border-left: 1px solid 000; } .wang-edit-text table td, .wang-edit-text table th { border-bottom: 1px solid 000; border-right: 1px solid 000; padding: 3px 5px; } .wang-edit-text table th { text-align: center; } 1One of the professional watch repairing tools, suitable for repairmen and amateurs to save expensive repair costs. 2Mainly used for ensuring normal working and stable performance of watch movement. 3Copper material is durable and not easy to deform, can effectively resist oxidation and rust, long service life. 4Suitable for watch makers and watch repairing workers to use, practical and wonderful tool. 5Wonderful replacement for the old or broken one, about 4.9cm / 1.93in of the diameter and 2cm / 0.79in of the height.