2 kinds of bars usage -Externally Threaded Stud (Rear Screw, Similar to Regular Earring Use) Bar Thickness: 0.8mm 1.2mm; Wearable Bar Length：6mm 8mm material: 316L -Internally Threaded Stud (Front Screw, Requires Guide Pin for Use) Only gem heads are available in this link, you can buy bars and Guide pin at bar and guide pin for internally threaded stud front screw requires guide pin for use One Stud post can be paired with multiple gemstone heads. You can buy multiple gem heads with one bar. Bar Thickness: 16 Gauge(1.2mm); Wearable Bar Length：6mm 7mm 8mm 10mm 12mm Material: G23/F136 Made of Stainless Steel, Safety Material for Your Skin MULTI USAGES - These studs piercings can be as lip studs, labret bars, helix bar, tragus bar, cartilage studs High Polished Smooth Surface, Designed for Comfort and Security, Easy to Put In and Take Out
