APT Industrial 101-0-0.3125 Chuck Reamer has a precise 0.3125-inch (5/16 in) diameter, offering exact hole finishing for metalworking projects. It is used to enlarge and finish drilled holes to a consistent size when operated in chuck-held drilling or milling setups. Part numbers 101-0-0.3125 and #172024 identify this tool for ordering and inventory purposes.
