Philips 540-011 TightRail Mini Rotating Dilator Sheath, 11 Fr X 6.1 in / 15.5 cm Size, Device Inner Diameter 112F / 0.145" / 3.7 mm, Outer Diameter 18.0F / 0.234" / 5.9 mm, Outer Sheath Inner Diameter 18.7F / 0.243" / 6.2 mm. Box of 01