Used for placement of .035 inch or .038 inch diameter wire guides into the vascular system when a small 21 gage needle stick is desired. Silhouette Transition less features a virtually seamless transition between the outer sheath and the inner dilator of the coaxial catheter. After initial access and placement of the .018 inch diameter Torq-Flex wire guide, the coaxial catheter pair is introduced. Removal of the inner dilator and wire guide facilitates placement of the .035 inch or .038 inch diameter wire guide through the outer catheter. Supplied sterile in peel-open packages. Intended for one-time use.