Hand Watch Crown Winder Helper Mechincal Winding Repair Tool 2.5mm-7mmSpecifications:Material: stainless steelLength: Approx.78mmOpening Diameter: Approx. 2.5mm、3mm、 3.5mm、 4mm、 4.5mm、 5mm、 6mm、 7mmFeatures:It is spring loaded for ease of useStainless steel handy tool for wind up your watchExcellent tool if the winder\/crown on your watch is small and hard to wind、 makes winding up all watches easierAdjustable、 fit most watch crownPackage Included:1 x Crown Winder