Want advise against buying this tool. The bitheads for the respective case back can be very shaky used in the bit holder. The setting of the correct diameter is via a continuously variable mechanism of the handle and can not be locked. So this setting adjusted very easily with the use and you slip quickly, resulting in scratches on the clock. The whole tool (although one should not really call it that) was very greasy / oily on. This does not facilitate dealing with it. I am then ultimately went to the watchmaker!
