Furnished anvils are quickly interchanged, and are etched with length. An adjustable stopper on the anvil permits calibration of the overall dimension at the anvil. The .315" (8mm) diameter anvil is micro lapped but not carbide tipped. The spindle diameter is .250" (up to 12") and .315" (over 12"). The spindles are carbide tipped and micro lapped for lasting accuracy. Appropriate standards supplied.