For high-volume production work with a CNC router use one of these plunge-cutting straights. Long, 3/4 shanks extend the bit's reach enhancing its versatility. Open-flute design promotes rapid chip clearance, Necessary for high feed rates. Left-hand configuration for counter-clockwise rotation top master machines. Chipbreaker option (special order): Designed to cut chipboard and MDF at high automatic feed rates found on CNC machines. Each flute is ground so that the chip breakers are staggered to each other, giving a straight cut. To order, add ‘CB' suffix (I.E.: (I.E.: #45454-cb), #45457, diameter (D): 3/4, cutting Height (B): 2-1/2, Shank (D): 3/4, overall length (L): 5, type: left hand, flutes: 2, 45457 CNC carbide Tipped straight plunge high production 3/4 dia x 2-1/2 x 3/4 shank L/H