The low-profile head saves weight while providing appropriate clearance for the bottle. The flange head better distributes load across nearly 3x more surface area than a cap screw and more than 2x the surface area of a button head providing both increased rigidity and lower stress.
Each bolt is machined complete in one operation from 6Al/4V Titanium on a Swiss Lathe. Threads are roll formed for peak strength and material grain alignment in the finished screw.
The screw head is machined for a 3mm hex wrench. And while titanium to virtually impervious to corrosion, it’s still a good ideal to apply a light coat of grease to the threads before installing.