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Cross Bits for Rock Drilling Working. Wide Diameter Range: Available diameters from 35mm to 127mm to suit various drilling needs. High Hardness Material: Made of carbide for excellent drilling penetration in very hard rock formations. Corrosion Resistance: Strong corrosion resistance ensures durability in harsh construction conditions. Versatile Applications: Suitable for digging hard, very hard, and crack-grown rock formations. Multiple Thread Options: Supports R22, R25, R32, R38, T38, T45, T51, ST58, and ST68 thread types. Efficient Regrinding: Designed to be reground at regular intervals to maintain efficient rock crushing.