Philips 560-011 TightRail Sub-C Mechanical Rotating Dilator Sheath, 11Fr X 6.1" / 15.5 cm Size, Device Inner Diameter 11.1F / 0.145" / 3.6 mm, Outer Diameter 16.4F / 0.213" / 5.5 mm, Outer Sheath Inner Diameter 20.9F / 0.271" / 6.9 mm. Box of 01