Spherical wheel bolts M12 x 1,5 x 20 mm, M12 x 1,5 x 25 mm, M12 x 1,5 x 30 mm, M14 x 1,5 x 27 mm
<a href="//commons.wikimedia.org/wiki/User:Raymond" title="User:Raymond">Raimond Spekking</a>
CC BY-SA 4.0
<span class="int-own-work" lang="en">Own work</span>