These sets contain multiple taper-shank drill bits in different sizes. They ensure users have a range of bits on hand for maintenance and repair tasks. Drill bits with a taper shank install directly into the spindle, driving sleeve, or socket of a machine such as a drill press or lathe. This allows the bits to be installed and changed out faster than drill bits that must be installed into a chuck or collet. Taper-shank drill bits are self-locking, which means the friction between the bits and the tool holder keeps the bits in place, even in high-torque applications. These bits should not be used in a collet or chuck.