Description: Material: Stainless Steel Stainless steel handy tool for winding up your watch. Crown on your watch is small and difficult to wind, makes winding up of all watches easier. Stainless steel construction of good quality, push at the end to open the jaws to fit most small to large crowns. This has spring mechanism, you push a side that opens the clamp, place on the crown then the spring holds the waterproof crown for winding. Specification: Total Length: Approx. 8cm/3.15inch Color: Silver This tool can be used on the following points: Winding your mechanical watch very easy and fast. Set the time or date of the watch in just a few seconds. Adjustable, each size can use in 3 or 4 dimensions of the crown Just press the piston on the head and the jaws lock to the crown of two tones presidential watches. Allows you to set the date quickly. Package Includes: 1 Piece 3.5mm Watch Crown Winder Helper 1 Piece 4.5mm Watch Crown Winder Helper Note: 1. Please allow slightly error due to manual measurement. 2. Due to the difference between different monitors, the picture may not reflect the actual color of the item. 3. Wish you a wonderful on line shopping!