Features: Both upper and lower are M6 thread, compatible for 5500A/5500C. It is easy to break the watch with other tool while to close for case with our tool. You can press the tool by tightening the top handle, which mean you have full control over the pressure used.Great for closing your watch for case after resizing or repair job. This watch bezelcloser can be used for pressing waterproof watch cases . Easy-to-use design that helps to press watch crystals and dies without risking any clamps on your hands and on the watch itself. The watch back for casecloser is necessary for watch repair for masterr, watch store, and so on. It is reliable to press the watch bezel for case, suitable for most watches. Specifications: Material:Alloy Color:Red Mixed Size Type: Watch Press Tool/ Watch Press Too l& 20 Dies Package Includes: 1 Set Watch Press Tool 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.