Drill bits with a taper shank can be directly inserted into the spindle, driving sleeve, or socket of a compatible drill or lathe, allowing the tool to be installed and changed out easily. Taper shank bits are self locking—the friction between the bit and the tool holder keeps the tool in place, even in high-torque applications. Taper shank drill bits should not be used in a collet or chuck.
General Purpose High Speed Steel
Made from high speed steel, these drill bits are a good choice for general purpose drilling applications in soft steels, carbon steels, wood, and plastic. Black oxide coating increases wear resistance for extended tool life and helps retain lubricants, improving chip flow and drilling performance. This coating is recommended when drilling ferrous metals and should not be used on nonferrous metals.