Hello guys new to the forum me and my family are literally ready to leave for a cross country road trip and i go to get gas in the car and hear a scrapping and a metal on metal sound well i get out and look at the caliper and there is a rather large bolt completely lose and almost fallen out please if you could help me identify this part I've been searching for hours thank you guys !

background on the car: 2015 Mercedes Benz S63 AMG its the drivers side front caliper ive included pictures of the part in question thanks again guys!






backup links incase the hyper links dont work:
https://ibb.co/GnJ614B
https://ibb.co/VDPgkXc
https://ibb.co/FHYBvsZ
https://ibb.co/qnpqVmW

Attached Thumbnails

       

That appears to be one of the caliper mounting bolts.
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