Profile: Datum Point Tool, Inc. provides carbide inserts and holders designed for high-speed corner rounding and the Radicator carbide back draft milling cutter. Radicator is an inserted carbide back draft milling cutter. Radstar™ offers one insert with two cutting edges, one holder and one screw. The unique V-shape design of the Radstar insert and holder allows for accurate & solid locating. An offset screw forces the insert in a downward fashion into a matching ground "V" in the holder.