Simple Extension Clasp:These connector clasps in simple design and small size, easy to open and closed, shining in appearance and nice craftsmanship for your various carfts. 20Pcs 4 Sizes:You will receive 20pcs fold over clasp in total.The dimensions range in length from small to large, with a length range of approximately 15mm to 17mm and a width range of approximately 3.5mm to 7.5mm, all with a thickness of 4mm. Brass Fold Over Clasps:These folding buckles are made of brass material, which has a smooth and comfortable surface to the touch, is sturdy and durable, and is lightweight without causing any burden on you. Widely Used:These silver folding buckles can be used to connect bracelets, necklaces, anklets, as well as jewelry chains and ropes, making your handicrafts more colorful and practical accessories for DIY homemade jewelry. How to Use:You can easily open or close these brass folding buckles, and they are not very difficult to use. The size may be a bit smaller, you can use tools to open them. SUPERFINDINGS 20Pcs 4 Sizes Fold Over Jewelry Clasp Brass Fold Over Clasps Silver Plated Jewelry Extender Seperate Foldover for DIY Bracelet Necklace Jewelry Making Craft Size: Rectangle: 15x3.5x4mm, 5pcs; Rectangle: 16x6.5x4mm, 5pcs; Rectangle: 17x4.5x4mm, 5pcs; Rectangle: 17x7.5x4mm, 5pcs; plastic bead containers: 6.8x5.2x1.1cm, 1pc. Material:Brass Metal Color:Silver