"MAXIMILIAN Benchmark Grooved Triangle Titanium Wedding Ring with Screws- 7.5mm This precision crafted comfort fit ring from our Titanium Wedding Rings line by Benchmark is made from tough aircraft grade titanium and is completely hypoallergenic. The ring is triangular shaped, has various grooves inside and outside, and has screws on the sides to give it a tough look. This unique ring can be worn as a Wedding Band or Promise Ring. Larson Jewelers is proud to present Benchmark's titanium rings line, which is the ideal metal for couples who what their wedding rings to be strong yet light weight. Truly Free Benchmark Lifetime Sizing and Lifetime Warranty on titanium rings, no exchange|sizing fees, which are charged by other retailers.