First of all, press the button on the strap with both hands to open the steel band lock of the metal watch; 2. Find the downward arrow symbol and place the watch steel belt on the plastic base according to the arrow direction; 3. Align the thimble with the metal steel needle on the bayonet and knock it out with a hammer, and knock out two steel needles as well; According to the thickness of your wrist, you can continue to disassemble other watch joints.