(50/48MM;46/44MM;42/40MM;38/36MM;34/33MM;32/31MM;30/28MM;26/24MM;23/21MM;20/18MM;16MM round molds; 20/25MM round flat molds) This watch back press is equipped with 12 molds suitable for most of the sizes of press fitting watch repairing and battery replacement use. sizes of press-fit watches suitable for repair and battery replacement. Watch back press tool is made of superior steel, sturdy and , well-made. The materials are quenched and hammered repeatedly. 1. Choose the right mold; 2. Big mold at the bottom. Small mold on the top; 3. Align the position, turn the cover upwards to tighten the screw, look at the space, there is no space on it. Watch crystal press is made of fine and smooth threads, which makes it easier to adjust the height. Colour: As Shown Material:Metal+Plastic Package Contents: 1x watch battery replacement tool kit Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.