Quantity and Size: Ring: about 16mm long, 12mm wide, 2mm thick, hole: 2.5mm; bar: about 18mm long, 7mm wide, 2mm thick, hole: 3mm,20 Sets in total. enough quantity will meet your DIY jewelry making needs. Simple to Apply: these round toggle clasps are easy to apply, you do not need to use other tools to finish your jewelry making work, just need to thread the bar through the hole in the round ring as a connection, and add attractive beads, gemstones and other ornaments to get your own piece. High Quality Material:These toggle clasps are made of 304 stainless steel, hand the high quality material makes these clasps hard, not easy to break, not easy tarnis, for long-lasting wear. Wide Application: They are great for necklaces that close in the front and add a lovely embellishment. They are good for those who may have difficulty putting on a necklace with a traditional small lobster clasp. Great DIY Craft: This toggle has a simple design to go with an piece of jewelry. It is the perfect size! It is not too big make your design unbalanced but still easy to for your hands to work.