Carbide chucking reamers provide excellent wear resistance when reaming the toughest materials, such as cast iron and stainless steel. For these reamers, reamers that are 16mm or smaller are made from solid carbide, and reamers that are larger than 16mm are carbide-tipped. Chucking reamers, also called machine reamers, enlarge or finish a hole to an exact tolerance or size for a precise fit when installing fasteners or other parts. The reamers' Morse taper shank 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 reamers from the toolholder. These self-locking reamers are held in place by the friction between the reamer's shank and the toolholder. They offer accurate centering and are often used in metalworking and high-torque applications. Chucking reamers have a 45° chamfer on the cutting edge to help ensure accuracy as the reamer enters the hole.