I received a Seiko solar bracelet watch as a gift and it was way too big.  I searched online for "how to remove links from a bracelet watch" found a YouTube instructional video using this very tool and so for $3.25 thought 'what the heck'?

There isn't much to it. There was another reviewer that said you needed a special tool to remove a Seiko watch band link -- I find this to be untrue.  The 'secret' is, you must look inside the watchband to find the arrow (stamped on each link) to determine which way the pin is to to be pushed out.  Once lined up, I turned the knob very slowly and the pin came out easily.  I did not use the tool to replace the pin, though I suspect you could. In about 5 minutes time, my watchband was adjusted perfectly.