This is the Basic Flaker. All of our pressure flakers are machined from Delrin, the preferred material by flint knappers world wide. This flaker has 2 set screws which enable you to use several different nail sizes ranging from the 10d up to the 20d copper nails. You simply center the two set screws pinching the nail in the middle of the bore. This flaker comes with an Allen Key. All pressure flaker tools are used setting percussion or pressure platforms, edging and notching. They can be used for virtually any type of pressure flaking. The tip is a hardened copper 20d nail. Replacement nails available. This Pressure Flaker is 6" X 7/8"