Features: Jump Ring Kit: Jump ring comes in four sizes, 4mm/6mm/7mm/8mm. Easy to Use: Can make four different sizes of coil and jump ring, can use different-colors of copper wire, aluminum wire, memory wire to make unique crafts. Simple assembly ring making tool with small size, which can save work space, no need to occupy redundant positions, is your best choice. Durable Material: This jump ring maker made of stainless steel construction for durability. High quality wire drawing machine, fine-workmanship, sturdy and durable, easy to operate. A professional ring tool designed for jewelry manufacturers. It also suitable for home, work, factory, etc to use. Specifications: Material:Stainless Steel Size: Approx.4mm/0.15" Approx.6mm/0.23" Approx.7mm/0.27" Approx.8mm/0.31" Package Includes: 1 Set Silicone Mold note: Please allow 1-2cm errors due to manual measurement,Please make sure that you do not mind before you order. Due to the difference between different monitors, the picture may not reflect the actual color of the item.