Weck Hem-o-lok Non-absorbable Polymer Locking Clips provide cool secure ligation; clip locks onto the vessel. The Weck Hem-o-lok system is available in a range of clip sizes Medium, Medium-Large, Large and Extra-Large. The Non-Absorbable polymer clip is inert, nonconductive, radiolucent, and does not interfere with CT or X-ray diagnostics.