Surgical Steel Flying Swallow Attachments for internal threaded shafts measuring 1.6mm. The attachments actually have the standard 1.2mm thread. These attachments will fit internal thread Dermal Anchor Bases, internal thread Labrets, Barbells, Curved Bars, etc. The Flying Swallow attachments are surgical steel and can be autoclaved. Length is 7.5mm. Oxidised effect item should not be brought into contact with solvents such as alcohol.