TCI Tricone Bits 17 1/2" IADC 437/517/537/637 API Standard Cr Series Rubber Sealed Bearing Bit for Water Well Drilling Material 42CrMo. Rubber Sealed Bearings: Features rubber sealed journal bearings for enhanced durability in harsh drilling conditions. TCI Tricone Design: Tungsten Carbide Insert (TCI) tricone bit optimized for medium soft to hard abrasive rock formations. High ROP Performance: Designed for high Rate of Penetration (ROP) to guarantee faster drilling and longer bit life. Versatile Applications: Suitable for water well, oil well, HDD, exploration, geothermal, and mining operations. Quality Material: Constructed from high-strength 42CrMo material for superior stability and wear resistance. Fast Lead Time: Average lead time within 15 workdays for both peak and off-peak seasons.