It's baffling how hard these things are to find. 3 hardware stores, nada. I've been repairing and restoring antique & vintage furniture and the #7 is quite common. I thought I'd buy zinc, strip them, then blue & wax. Can't find #7s. Blacksmith Bolt & Rivet to the rescue. I needed 3; ordered 25. I'll be stocking up some bulk soon.