Why are Japanese snow guards bolted?

Overseas, I think that there are many cases to fix and use snow guards with nails. However, in Japan, shapes using bolts are often used. In Japan, bolted snow clamps are often used in Japan, striking the nails directly on the roof and fixing the snow clamping fixtures to hurt the roof, causing leaks etc.

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There was observation of the first snow in Japan.

On October 17, we observed the first snow in Kushiro, Hokkaido.
This is the first snow observation in the whole country this season.
The snow quality of Kushiro is Powder Snow. Our snow clamps, Shinpei (middle), AT ceremony (W) etc. are active in Hokkaido area.

 　　　　　　　　　　　　　　　　　hinpei (middle)

　　　　　　　　　　　　　　　　　AT ceremony (W)