Jump ring opening tools, each inner diameter is about 17 mm/ 0.67 inch, outer diameter is about 20 mm/ 0.79 inch and width is about 7.8 mm/ 0.31 inch; proper size to meet your different needs to fulfill in work and daily life The ring opening and closing tools are made of stainless steel, durable and sturdy to use, not easy to break or deform, resist rust and corrosion, can serve you for a long time. Easy to carry and store, bring you great convenience Each stainless steel jump ring opener is designed with 4 grooves that allow you to easily open or close jump rings. You can also wear it on your hand as a decorative ring, and the chic design will bring you an exquisite effect The Circle Jump Ring Tool is an essential tool for making and repairing some projects in your daily life, it will bring you much convenience and convenience to use. You can use the jump ring opener tools on various projects such as: B. Jewelry making, opening and closing jump rings, repairing necklaces, etc. You can also combine the ring with your other decorative accessories to make it stand out.