Same as the Single Guide Cannula for Mice, except that the stainless-steel tubing extends above the plastic pedestal to a specified length. It is made to connect PE tubing directly to it and eliminates the use of an internal cannula. If you need a different upward projection than the 3mm referenced above, specify what is needed when placing your order. A higher projection will mean a very tall dummy cannula cap to accommodate a higher upward projecting tube.