What are the specifications of the engraving machine handle?

The handle has specifications of 30, 35, 40, 45, 50, 60, etc., indicating the diameter of a certain part of the taper handle (the specific position is different in different standards). The specifications of the cone are usually selected by the machine tool manufacturer according to the effective power of the machine tool or the total length of the tool used, and are also related to the production country (DIN standard in Europe, ANSI standard in America, JIS standard in Japan). Commonly used tool rest specifications are 30, 40 and 50, of which 40 is the most widely used.