Makita P-77300 Straight Double Flute Router Cutter 12 x 20mm is 70mm overall length. Can be used for profiling, edging, grooving, slotting, rebating and recessing into a wide variety of different materials. 12mm diameter. 20mm length. 70mm overall length. 1/4" shank (6.35mm). Can be used for profiling, edging, grooving, slotting, rebating and recessing into a wide variety of different materials. Natural and man-made timbers and plastics.