Multi-Purpose Knife And Tenon KnifeMaterial: hard alloy. Model: multilateral The knife is used to cut the polyhedron interface, making it easier to make flowerpots, columns and buckets. Just choose the type of knife that corresponds to the surface number of the polyhedron you want to process. The correct Angle incision gives the extra bonding surface, and the adhesive mechanical strength is greater. For 6 sided or 8 sided machining, surface upward cutting, for 12 sided body or 18