High-speed steel chucking reamers provide good wear resistance in general purpose reaming applications for enlarging or finishing an existing hole to an exact tolerance or size for a precise fit when installing fasteners or other parts. These reamers have a Morse taper shank that inserts directly into the spindle of a compatible drill press or lathe or into an adapter such as a Morse taper sleeve or socket to maximize efficiency when installing and removing the reamers from the toolholder. Morse taper shank chucking reamers are self-locking, which means the friction between the reamer's shank and the toolholder keeps the reamer in place. They provide accurate centering and are commonly used in metalworking and high-torque applications. Chucking reamers, sometimes called machine reamers, usually have a 45° chamfer on the cutting edge to help ensure accuracy as the reamer enters the hole.