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Due to the national holidays as Golden Week, we will close 2018/4/28~2018/4/30 and 2018/5/3~2018/5/6.
This may cause delays with our responses. Thank you for your understanding.
In the case of making the hole diameter a little larger, it was necessary to replace the hole saw in the past, but it is very easy to use because it can be processed as it is to an arbitrary size.