Allows templates to be placed either on top or the bottom of the material, for ease of routing. Dimensions: D=19 mm C=50 mm B=19 mm A=90 degrees Shank Diameter=1/2 inch Shank Diameter: 1/2 Grade: TCT Diameter Metric: 19 Cut Length Metric: 50 Bearing Diameter Metric: 19 Angle: 90