5 EXTRA STRONG, HEAVYWEIGHT, STERLING SILVER OPEN JUMP RINGS Outside ring size: 5 mm Wire thickness: 1 mm Jump rings are not stamped 925 but are guaranteed sterling silver, and are purchased from a reliable European supplier TECHNICAL TIPS If you are looking for a secure way to attach a charm or pendant to a necklace chain or bracelet, take a look also at the various lock rings that I sell in my Tulip Beads eBay store. Open jump rings sideways as this helps to retain their shape. This is best done using two pairs of pliers or a jump ring tool (link below). SEE THE JUMP RING TOOL THAT I SELL IN MY EBAY SHOP TO HELP WITH OPENING AND CLOSING JUMP RINGS https://tinyurl.com/ybppdvb7 POSTAGE I offer postage discounts for multiple purchases when items are paid for in a single transaction. Discounts are calculated automatically by eBay. Please note that if you want to buy more than one item, do not select the buy now option, simply put the items you want in the basket and pay when you are finished. UK customers pay £2.35 for Royal Mail 1st Class service (on items that are not offered with Free Delivery). Royal Mail Signed For service costs £4.20. There is a charge of 6p for each additional item after the first item.