The bolster has two different functions. Frst to lock the blade when the knife is open and second
to hide it within the handle when being closed. Generally it is made of one piece of forged spring
steel with a fly/bee welded onto it. The decoration on the bolster is called "Guilloche".

In very exclusive production lines the bolster and the fly/bee is forged by hand from 
one piece of INOX-spring steel and also decorated by manual labour. In the line Luxe the
"Guilloche" even extends to the back of the knife.