Four-Radius Corner Rounding Template
A 100 x 100 x 4 mm hooked template with a different corner on each side: 1/4 in (6.35 mm), 1/2 in (12.7 mm), 3/4 in (19.05 mm) and 1 in (25.4 mm). Hook the 6 mm fence lips over the corner of a board or panel, then trace or flush-trim the arc so every corner of a shelf, lid or plate comes out the same. Through-holes next to each corner (one dot for the smallest radius, four for the largest) tell you which radius you're on.
tool corner-radius template woodworking