Features: Product material is strong, durable, long service life. Please check the size clearly before the purchase. Suitable /generic for ETA 2824/2836/2846/2879/2789, etc, Circle: bottom and top, The outer diameter of the bottom is about 35.3mm, The upper outer diameter is about 30mm: the total height is about 7.6mm NOT included the movement in the picture and the package.