The angled blades on these reamers are for use on holes with keyways and other interrupted cuts. One tool can ream multiple hole sizes. To move the adjustable blades within the diameter range, tighten or loosen the two nuts on the reamer. They are often used for reaming bushings to a precise fit when the size needs to be determined during assembly. Blades can be reground and replaced. To measure size, adjust blades to a known size (such as a bushing or ring), or measure across two opposite blades with a micrometer.

Optional extension pilots (not included) can be used in place of the end adjustment nut to align holes that are spaced far apart.