The 2.3 mm diameter by 46 mm long Standard Dental Implant Pilot Drill for the preparation of initial osteotomy when you need and extra long drill. With easy to read laser-etched depth markings at 7mm, 11mm, 13mm, 13mm and 14 mm. Drills are available in 5 different total length and can be precisely fit in our M19235 and M15235 Titanium Sleeves for the fabrication of Implant placements Guides they also can be fit with our Adjustable Pilot Drill Stopper APDS2300 for customized osteotomy depth adjustment.