The high-speed steel jobber-length drill bits in these sets provide more flexibility and absorb more shock and vibration than cobalt and carbide jobber-length drill bits, making them suitable for use in manual drilling machines and handheld power tools. They may leave a rough finish on the hole. These sets contain multiple drill bits of various sizes.
The cobalt jobber-length drill bits in these sets tolerate higher drilling speeds and are harder and more wear-resistant than high-speed steel jobber-length drill bits. They provide some shock absorption and can be used in handheld power tools. These sets include multiple drill bits in a variety of sizes.
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