Groove cutting disc HW

Disc cutters, 40 mm across in thicknesses from 2 to 5 mm, that mount on a separate spindle. A disc cuts a groove into the side of a workpiece rather than down into its face — which is how you rout a seal groove into a door frame in situ, or a repair groove into a laid parquet floor. The thickness is the groove width, so pick by the seal or spline it has to take.