+2 screw was rust, so I replaced it for +3 and used it. Although Bessel has been using it for a long time, it is strong to fluffy. I was able to use it with confidence though it turned gangann with impact. It is regrettable that it seems cheap because it is only colored. I would like silver and plating. Bit body also has the same thickness as a whole, but I want the center to be thinned.