ITEM NAME:10Pcs/Set Brass Jump Ring Open Close Tool For Jewelry Making Finger Helper OZ Features: Function:Jump Ring Open Tools Simple and practical tool for jewelry making Fashion & practical at the same time. There are four groove of different widths, for auxiliary open different thickness circle ring. A good helper for your own jewellery. Specifications: Color:Gold Inner diameter:16mm/0.63in(Approx.) Dimension:Approx.19mmx 7mm/0.75inx0.25 Material:Brass Package Include: 10 PCS Jump Ring Open/Close Tool Note: 1.Please allow 0.1-0.3cm differences due to manual measurement, thanks. 2.Please understand because of the light irradiation or computer display difference, so I can't guarantee photos and real color is 100% the same..A good helper for your own jewellery. There are four groove of different widths, for auxiliary open different thickness circle ring. Function:Jump Ring Open Tools. Simple and practical tool for jewelry making.