Adjustable Ring Base Blank: about 17mm in inner diameter as standard but can expand. These rings are adjustable to fit most ring sizes, so you don't have to worry about stocking up on multiple sizes. 3 Styles Ring Blanks Tray: 20mm, 15.5x15.5mm, 13x18mm, Ideal for gluing on buttons, beads or anything else to create unique rings. Great DIY accessories for home jewellery making and hobbies. Quantity: 10pcs each shape, 50pcs rings bezel trays in flat round, oval and square shape, more shape and quantity can offer you more DIY craft projects choices. Easy to Use: Paste the lovely pattern with the clear glass cabochon, then cover the glass cabochons on the ring pendant tray, and then the unique finger ring is finished. Ready for Ring Making: You also can add other cabochons, cameo, stamp, engrave, glue letters, logos, resin, gemstones photos or some tiny beads into deep trays make gorgeous necklace jewelry.