Double Threaded Disk 6AL4V ELI F-136 Implant Grade Titanium or 6AL 7NB F-1295 implant grade titanium Internally Threaded for 1.6 mm (14G) and 2 mm (12G) Vendor: Industrial Strength Fits Industrial Strength barbells in 14G/12G and fits internally threaded barbells in 14G/12G from all APP approved jewellery vendors (USA)