These are bulk wholesale chinese bonsai knob cutters. Standard 8 inch length. They are the highest grade available. There are now different grades available in china. These tools are used for making the final cut close to the trunk after you have cut away most of the branch with the concave cutters. They in a way melon scoop out the base of the branch away from the trunk, making an area that will heal over cleanly. You would use cut paste on a wound like this. Make quantity selection below.