NTI Gates Glidden Drills from Axis Dental are German-made, high quality stainless steel drills, available in two lengths. These drills are used to efficiently enlarge the upper portion of the canal in endodontic procedures. NTI Stainless Steel Gates Glidden Drill is ideal for endodontic procedures that involve root canal enlargement, specifically the upper section or the coronal third. It includes a right-angle latch, a guide, and a non-cutting tip that comes in various sizes.