The supports are compatible with 10mm round cabochons. You will find some in my shop in the "cabochons and supports" section. Put a dot of glue under the cabochon (superglu for example), then stick it in the support. With flat pliers you can gently bend the edges inwards. The advantage of these brackets is that they have serrated edges, so you can connect them with connector rings. It makes lovely bracelets! Also for earrings, long necklaces, bag jewelry, key rings, ... - If you buy multiple items, don't forget to tell me ask for the total BEFORE paying by ebay or mail, because the reduction of shipping costs does not happen automatically, and the ebay cart is not working well. My dear European customers and from all over the world, if you want a tracked shipment, please ask me by email, I.