Template thickness should be 5mm thicker than cut length of cutter. Dimensions: D=19 mm C=11 mm OL=55 mm B=19 mm R=3/8 inch R=9.5 mm Shank Diameter=1/4 inch Shank Diameter: 1/4 Diameter Metric: 19 Cut Length Metric: 11 Bearing Diameter Metric: 19