I bought this as part of the finishing touches to my renaissance faire attire after seeing something similar on game of thrones, thought it was a cool way to carry an extra knife or dagger. (Another purchase from museum replicas) It is all leather with 4 adjustable buckles, two to hold it on the belt and two to hold a knife or dagger. The ends of the frog are different sizes, probably so as to make a dagger/knife easier to draw.
Sadly I have a short body frame so the frog when worn hangs almost below my rear. Other than that I have no complaints except that I am short in height