Final answer:
High-Speed Steel (HSS), cobalt, and carbide bits are the most durable, with carbide being the best for frequent use due to its superior longevity and heat resistance.
Step-by-step explanation:
The type of drill bit that is harder and more long-lasting is typically made from high-speed steel (HSS), cobalt, or carbide. For regular use, cobalt bits are known for their durability and heat resistance, which makes them suitable for drilling into harder materials.
However, for the utmost in longevity and performance, especially for frequent use, carbide bits are the best choice. These bits maintain their sharpness longer and can handle high temperatures without losing their edge.
High-Speed Steel (HSS) Bits: HSS bits are a common and economical choice. They are made from a type of tool steel called high-speed steel, which can withstand high temperatures generated during drilling. HSS bits are suitable for a variety of materials, including wood, metal, and plastics. They provide good durability and are a step up from standard carbon steel bits.
Cobalt Bits: If your customer is looking for even greater hardness and longevity, cobalt bits are an excellent option. These bits contain a significant percentage of cobalt, which enhances their hardness and heat resistance. Cobalt bits are particularly well-suited for drilling through hard materials like stainless steel and cast iron. They are more expensive than HSS bits but offer extended durability.
It's important to match the type of bit to the specific materials the customer will be drilling. Additionally, ensuring that the bits are stored properly, such as in a dry and cool environment, can further contribute to their longevity. Always check the manufacturer's recommendations and guidelines for the specific bits being used.