These handy jump split rings are ideal for making jewellery or for replacing those missing or broken joins in your jewellery. With an outer diameter of 4mm-10mm and a thickness of 0.8mm-1mm. They are designed to be discreet but thick enough to give strength. Material: Hypoallergenic 304 Stainless Steel for Yellow Gold, Rose Gold, Black Colour, and Hypoallergenic Iron Steel for silver and Bronze Colour. Diameters: 4,5,6,8,10mm Thickness: 0.8-1mm Quantity: 1000 Pieces Bulk Pack