![Large Winged SE Clock Key 3.50mm (10591788239)](http://perrinwatchparts.com/cdn/shop/products/74.262-6to16-300_300x300.jpg?v=1595351424)
Large Winged SE Clock Key 3.50mm is a single ended clock key made of brass. A Large Winged Single End Key 3.50mm does not have a logo printed on the key and fits a winding arbor square of 3.50mm. This equals to a key stamped with the number 5. The large wings on this key allows the user a better grip when winding a clock.