Where To Buy Stainless Steel 5/16 in. (8 mm) Thor's Mjollnir (Hammer), Dome Ring

The ring is cool but the sizing is off. Mine is too small. I wrote to the Co. but got no response. Good thing it was only $10.Get more detail about Stainless Steel 5/16 in. (8 mm) Thor's Mjollnir (Hammer), Dome Ring.