Threaded, parallel sided post with rounded, undercut head. For direct core restoration on one appointment. Drills Two-Fluted - Size 5.5, Purple .055" (1.40 mm) 3/Pk. Non-cutting tip to prevent damage. 7, 9, and 11 mm laser marks to identify the depth. Color-coding enhances instrument management. Matches the sizes of posts. ParaPost X-System Drills are double-fluted cylindrical instruments guaranteeing maximum cutting action and are built with a blunt end that prevents perforations. These color-coded drills have been calibrated according to the depth of the preparation and correspond with ParaPosts to achieve an ideal thickness of the cement film.Available in a range of sizes and colors. Size # 5.5 drills have a diameter of 0.055 inches and a length of 1.4 mm.