All of the cemented carbide indexable inserts type t are in triangles. Some of the cemented carbide indexable inserts type t have a hole through them, while others don't. Those cemented carbide indexable inserts type t are distinguished by the hole and the lines on their surfaces. The "t" in cemented carbide indexable inserts type t refers to the following indexable inserts who are in isosceles triangles, thus, t for triangle. If you have any other questions or inquiries about tungsten carbide indexable inserts type t, please feel free to contact us.