Made of high quality plastic with a smooth finish for effective blockage of tubing. Flowstop is a hemostat clamp used for blocking thin and thick- wall flexible tubing (3-11mm.). The smooth jaws completely block the tube without cutting or damaging. The lock has several precision ratchets to accurately provide necessary pressure. FLOWSTOP is excellent for dialysis, blood units, I.V. sets, feeding tubes and removal of catheters without damaging the catheter.