I had a spiral type, but I wanted to try it and tried to buy it. Although M3 seems to be out of specification, I opened a hole of 2 mm in the middle, and it took out with one shot. I like the degree of digging in, it may be more like helical type.
It is a necessity for maintenance of a motorcycle. If you use this, you can not use conventional spiral type extractors. I am satisfied because it is not a type that turns right overseas. Because it is a consumable item, I think that I will purchase repeat.