4 Gauge Externally Threaded Steel Tunnel$6.99
4 Gauge Externally Threaded Steel Tunnel
5mm tunnel. Stainless steel threaded tunnel. Threaded tunnels have a 5/16" (8mm) wearable surface, which is the space between the flares. Plug sold individually.
4 Gauge (5mm), 316L Surgical Stainless Steel, Externally Threaded, Sold Individually