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Drill rods, typically made from premium quality steel, are slender, cylindrical bars that connect the drilling machinery to the bit at the bottom of the borehole. They serve as a conduit for transmitting torque, drilling fluid, and the force necessary to advance the drill bit into the ground. The term drill rod steel refers to the specific type of steel used in the manufacturing of these rods, which must possess exceptional mechanical properties.

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The hardness of limestone can vary greatly, from relatively soft to extremely hard, depending on factors such as its mineral content and degree of compaction. Soft limestones can be easily drilled using standard drilling equipment, but harder varieties often necessitate more robust machinery and specialized bits. Carbide-tipped drill bits, for instance, are commonly employed due to their durability and ability to withstand the abrasive nature of limestone.

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