According to the groove shape of the product, it can be divided into three types: straight groove, spiral groove and arc groove;
According to the number of blades, it can be divided into single-edged, double-edged, three-edged, four-edged and multi-edged step drills;
Step drills are normally a national standard, and most of them are custom-made non-standard in daily industrial use. Generally, step drills can be produced by manufacturers who provide drawings.
