20mm Hoop Earrings for women and men: 8 gauge (thickness: 3.0mm), inner diameter 20mm ( 0.79 inches ). Please check the inside diameter carefully and select the most suitable size for yourself. Made of 316L surgical steel, high polished. 316L steel is the most basic metal used in body jewelry. It is the basic requirement of metal to be used in initial piercings and for healing. For most people this grade of steel works just fine. Sold individually. It can be worn in ear lobe piercing. Easy to open and close the click closure by hand, Not require a tool.And it's still tight after longterm use, needn't to worry about lost when bathing, walking or exercising. If you have any questions, you can feel free to contact us.