Very nice design button For fixing screws m4 or m3 conical hole. d40 mm height approx. 30 mm
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/https://fbi.cults3d.com/uploaders/13219520/illustration-file/58653ee0-e275-45df-acef-813393109b17/B%20P%20C%20ETOILE%20M4%20D40MM%20H30%20C.JPG)