INCLUDED: Two Screw drivers, two middle links, two top links & pins. 

Carefully lay the watch and two screw drivers in front of you. The pin in the link is a screw pin (not a push pin). Hold and isolate the one screw driver on one side. Then grab the other screw driver and turn the other side. It is a barrel and screw pin. Pull the pin out. Now you can add or remove the link.