These are U.S. made blackened brass eyelets. These will fit into 1/4” diameter holes. The 8-8 size is perfect for joining two layers of .060 or .080 material together. They will also allow you to join up to .080 to .125 materials. They are not long enough to join .125 to .125 materials. Please check out our tooling section to find some low-cost eyelet setting options.