Skeleguitar Attachment (Barbell not included) Measuring 6.5 x 5.6 mm Internally Threaded for 18G/16G 14Kt Yellow Gold Non-Sterile Thread not in Gold Vendor: Body Gems Fits Body Gems barbells in 18G/16G and fits internally threaded barbells in 18G/16G from all APP approved jewellery vendors (USA)