 and it runs a an even larger belt and it's mostly exposed uses four different pulleys but it's not a square shape there's a section on those pulleys that is adjustable that is set at a specific angle or you can adjust that angle and then the user brings the knife to the belt and puts the edge in contact with the belt at that selected spot so for example i could set the angle to 20 degrees or a standard kitchen knife or or even a finer pocket knife