Crestal Drill Bit ⌀4.0 Green Coil. Crestal Drill Bit ⌀4.5 Blue Coil. Crestal Drill Bit ⌀5.0 Red Coil. Serrated Blade Bur 40mm Long. Serrated Blade Bur 28mm Short. After drilling, be sure to use the Depth Gauge and Stopper to check the opening of the maxillary lower border.