Although I purchased a 50 mm grindstone to use with a grinder, there is a problem with how to take pictures. In the photograph, the threaded part looks like 1.5 ~ 2 cm, but actually it is about 6 cm in length. If you attach a 50 mm foil, the grinder and foil It will be quite an area originally I use a small foil for fine work, I think that the distance was opened so much that the usage was different from the original use that fine work is difficult to do But