Price listed is for each spring hinge. Flattened these would measure about 16mm long by 11mm wide. These are for clamper bracelets. The inside has curved brass that goes around the clamp onto the pieces you are using to make the bracelets. You might be able to get them tight enough without solder but, we would recommend that they also be soldered. Open the inside measurement on each side is about 10mm wide by 4mm thick.