Tunnel plugs with a 4mm attached jump ring that are crafted with gold pvd on 316L stainless steel and provide a secure fit with a screw-on back for easy installation. Add a charm to the jump ring for a customized look! The full length measures 12mm with a wearable area of 8mm, and sizes range from 2G (6mm) to 5/8" (16mm). For healed piercings. Externally threaded. Sold in pairs (2pcs).