Philips 540-513 TightRail Mechanical Rotating Dilator Sheath, 13 Fr X 18.7" / 47.5 cm Size, Device Inner Diameter 13.2F / 0.171" / 4.3 mm, Outer Diameter 20.0F / 0.260" / 6.6 mm, Outer Sheath Inner Diameter 25.0F / 0.319" / 8.1 mm. Box of 01