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     Cutting Structure:The durability of premium tungsten carbide insert is improved with new formulas and new techniques for insert bit.

    Gauge Structure: Multiple gauge protect with gauge trimmers on the heel of the cone,tungsten carbide inserts and hard facing on the shirttail increases gauge holding capability and bearing life.

    Bearing Structure:High precision roller bearing with two thrust faces.Ball lock the cone.Hardface head bearing surface.Cone bearing inlaid with friction-reducing alloy and then sliver-plated.Abrasion resistance and seizure resistance of the bearing are improved.

    Seal and Lubrication :Premium O-ring,Optimal seal compression and curved seal structure can enhance the seal performance.The pressure compensator system and advance grease can greatly increase the lubricating reliability.