Yonico 18153 1-1/4-Inch Louvre Slat Router Bit 1/2-Inch Shank This shutter louvre bit has a cutting height of 1-1/4" and a cutting depth of 1/4". The overall length is 3-3/8" and the shank is 1/2" Create louvre slats for window shutters Premium C3 micro-grain tungsten carbide blades for a sharper & longer lasting edge For use on table mount router Silver induction brazing for maximum strength and durability