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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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One of the key benefits of using a center drill bit is its ability to prevent the twist drill from wandering when starting a hole. This is particularly important in materials like steel, where a misaligned drill can cause significant damage or even render the piece unusable. Additionally, the center drill bit's design helps to transfer the cutting force from the drill to the workpiece more evenly, reducing the risk of breakage and improving overall stability Additionally, the center drill bit's design helps to transfer the cutting force from the drill to the workpiece more evenly, reducing the risk of breakage and improving overall stability Additionally, the center drill bit's design helps to transfer the cutting force from the drill to the workpiece more evenly, reducing the risk of breakage and improving overall stability Additionally, the center drill bit's design helps to transfer the cutting force from the drill to the workpiece more evenly, reducing the risk of breakage and improving overall stabilitycenter drill bit.

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