Description: Package IncludesThere are 1 transparent base and 4 metal shaft cores in package, great for jewelry making accessories.4 SizesThere are 4 Metal Shaft Cores in diameter 4mm/0.16inch, 6mm/0.24inch, 7mm/0.28inch and 8mm/0.31inch for different needs.High QualityPremium Acrylic Wire Winding Base and metal wire winding shafts for jump rings, durable, lightweight and long using time.Easy To UseYou can choose the circle diameter you need and install on the base first, and insert the wire into the small hole and folded fixing, then you can put your finger into the large hole and turn clockwise ensuring the shaft and thread are fixed, and you can take out the wire circles and cut the circle, finally you can start your crafting projects.Wide ApplicationsWinding Hand Tools for Open Jump Rings are great for both beginners and professional. Also a perfect gift set for families and friends who diy jewelry crafts. Specification: Material: Metal Size Chart: 4mm/0.16inch6mm/0.24inch7mm/0.28inch8mm/0.31inch Package Includes: 4 Metal Shaft Cores1 Transparent Base Note: 1. Please allow slightly error due to manual measurement.2. Due to the difference between different monitors, the picture may not reflect the actual color of the item.3. Wish you a wonderful online shopping!