When the battery has died on your wristwatch, then this is for you! Easily replace your watch's battery at home with this durable universal opener. This opener is universal and fits all watches and winders with threaded cases. Adjustable distance to fit all sizes of watches and movements. Fits watches with a diameter between 13-56mm. Quantity: 1st watch tool for battery change. Size: 7.5 x 3cm Change the battery of your wristwatch easily at home with our durable universal opener Fits all watches and winders with threaded case for versatile use Adjustable distance to fit all watch sizes and movements Practical tool with a diameter capacity of 13-56mm Compact and flexible design, 7.5 x 3cm, for comfortable handling. Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.