Spherical micrometer anvil
A spherical micrometer anvil is a specific shape of anvil used in conjunction with a micrometer. Sitting opposite the spindle, the anvil of a micrometer holds the measured object in place. The spherical micrometer anvil, also known as a ball micrometer anvil, makes contact with the object at one point, making these anvils perfect for measuring thickness on cylindrical or rounded surfaces.