Recessing cutter will accommodate the Schlegel Aquamac 63 weather strip system & allows for a particularly small gap between sash & frame. The slot can be positioned part way down the side of the rebate, or at the bottom of the rebate. D=41.3 mm. D2=28.3 mm. C=4.8 mm. C2=2.7 mm. Overall length=67 mm. B=22 mm. Shank Diameter=1/2 inch.