The length of the bar is 7 mm.
The vertical inner diameter on the 8mm model (distance between bar and inner, lower tip) is 8 mm and the horizontal inner diameter is 10 mm.
The vertical inner diameter on the 6mm model (distance between bar and inner, lower tip) is 6 mm and the horizontal inner diameter is 8 mm.
Moreover, the piercing is made of high-quality stainless steel.