Specification:
Features: 
Both upper and lower are M6 threads, compatible for 5500A/5500C
Great for closing your watch case after resizing or repair job.
You can press the tool by tightening the top handle, which means you have full control over the pressure used.
It is easy to break the watch with other tools while you feel it prefect to close case with our tool.
Face down configuration means the repair person sees the case back being closed.
Specification:
Material: Stainless Steel + Aluminium
Color: Shown As Pictures
Press Tool Size: Approx. 11.1 x 10.85 x 19.6cm / 4.37 x 4.27 x 7.72inch
Round Size: 18/20 21/23 24/26 28/30 31/32 33/34 36/38 40/42 44/46 48/50
2 Round Dies: 16/16 20/25mm
Size: 20 25 30 35 40 45mm
Size: 36.8 44mm
Weight: 1620g
Type: Repair Tools & Kits
Package List:
1 * Watch Press Tool
20 * Dies
Note:
The measurement error is about 2 mm, thank you for your understanding.
There is an error in the size of manual measurement, thank you for your understanding.
Instructions: 
1. Choose a die which is bigger than the watch crystal and install it at screw-socket of under pliers. 
2. Choose other die which is smaller than the rear cover and install it at screw-socket of up pliers. 
3. Put a watch crystal adown at the under die and put the rear cover at a suitable position. 
4. Lightly press down. 
5. Putting a cloth under the watch crystal will the watch crystal.