One Classic Arrow Spiral Barbell, 316L Surgical Stainless Steel spiral barbell, externally threaded. This stainless steel arrow spiral barbell has one arrowhead spike end and one 5/16 inch (8mm) diameter feather arrow end, externally threaded. Both ends can be removed. The spiral barbell is available in 18 gauge, 16 gauge, or 14 gauge in 1/4 inch (6mm), 5/16 inch (8mm-), 3/8 inch (10mm), 7/16 inch (11mm-14g only), or 12 inch (12mm-14g only) inner diameter. Inner diameter is measured in a straight line across inside of spiral barbell. These are sold individually, not in pairs. Photo is enlarged to show detail.. This item is suitable for arrow nipple rings, helix piercing, cartilage hoops, ear lobe piercing piercings, tragus earring, spiral belly ring, mens cartilage earrings, spiral belly button ring, cartilage piercing, or almost any 18 gauge, 16 gauge, or 14 gauge piercing.