This is basically a paracord bracelet but with a metal D-ring in the middle and a plastic buckle. For this one i used 2 different colour cords a "welded aluminium D-ring" and a 25mm buckle i cut out of an old belt. (All are available from e-bay)
Starting with one end of the buckle i chose the male end because the wholes are easier to thread the cord through. So take one end of each colour cord and thread them from front to back and then split around the side. I then placed one under and one over and used a simple overhand not to secure each end to the opposite colour (this is basically a fisherman's know with something in the middle) Then slide it down and pull it tight. Be sure to leave a small amount of tail end on each end.