The Vermeer Premium 5" (12.7 cm) Ace directional drill bit is our best Ace bit, offering superior durability, longevity and wearability to horizontal directional drilling contractors who need a tool for high risk, aggressive ground conditions. ✔Greater level of carbide coverage compared to other HDD bits increases reliability. ✔Carbide buttons placed strategically on each side reduce wear and enhance product life. ✔Aggressive tapered bit front improves penetration rates. ✔Ideal HDD tooling for productivity in heavy cemented cobble, hard packed soils and softer shale.