When sourcing drilling bits, the price is primarily driven by material composition and manufacturing technology. For metalworking, HSS (High-Speed Steel) with Cobalt (M35/M42) is more expensive but offers superior heat resistance compared to standard HSS. For mining or construction, Tungsten Carbide Inserts (TCI) or PDC (Polycrystalline Diamond Compact) bits command a premium due to their extreme hardness and longevity. Always verify the Rockwell Hardness (HRC) rating and the coating type (such as TiN, TiAlN, or Diamond-like Carbon), as these directly impact the tool's lifespan and justified cost.