N-Tralig Intraligamentary Syringe, Metric 1/Pk. Stainless Steel, 1.8 ml Cartridge Size. Delivers precisely 0.2 cc of anesthetic per ratchet. The positive ratchet action helps protect against breakage of the anesthesia cartridges. This stainless steel syringe features a removable hub, which allows the use of the 30 degree adapter hub to help with the most difficult to reach injections.