Material: Stainless Steel/Titanium(not for the lock cylinder) lock cylinder 19mm length, allow wire seal Available Hook Rod Thickness/gauge: 2mm,3mm,4mm,5mm,6mm,7mm,8mm,9mm,10mm. Other thickness is also available,but please inquiry before order. There maybe extra charge. S style option's U shape inner diameter: width 15mm, height 13mm L style option's U shape inner diameter: width 21mm, height 16mm Features of titanium: In same volume, titanium is about 60% of the weight of stainless steel Non-magnetic and non-toxic Excellent corrosion resistance, will not rust ever Outstanding biocompatibility, will not cause allergic reactions Recognized as the best body piercing material The safe anodized coloring process principle gives the product more color choices, not only practical and more beautiful like your piercing jewelry or chastity jewelry