Handy Watch Crown Winder Manual Mechanical Winding Repair Tool for Watchmakers 6.5mm Size:2.5 / 3.0 / 3.5 / 4.0 / 4.5 / 5.0 / 5.5 / 6.0 / 6.5 / 7.0 / 7.5 mm Winding your mechincal watch very easy and fast. Set the time or the date of the watch in just a seconds Just depress the plunger on end and Package Included: 1 X Crown winder