The single edge of tungsten steel grinding head is used by fitters, that is, metalworking. Double-edged is wood carving, that is, carpentry. 3-4 blades are used for jade, ceramics and glass, that is, masonry. The number of grinding heads depends on the material you want to process. The size of the material to be discharged, whether it is sticky or not, the metal has a certain viscosity, so it needs to be unilateral. Aluminum alloy in metal, whether 606 1 or 7075, is a carpenter's double-edged sword, because the viscosity of aluminum alloy is greater than that of steel. Low viscosity such as glass, ceramics and diamond. In fact, it can be used, but the efficiency and law are very different when used correctly. For example, if rust needs to be removed, four blades can be used. However, it is easy to break the edge with a single-edged drill glass. I hope you can understand that the number of blades of tungsten steel grinding head determines his type of work, not whether tungsten steel is used in woodworking. Tungsten steel grinding head is suitable for all kinds of materials from soft to plastic to strong to diamond.