THIS IS AN ALLIED MACHINE & ENGINEERING 131111-51 TWIN BORE BORING MILLING HEAD, DESIGNED FOR PRECISION TOOLING AND ACCESSORIES TASKS. IT FEATURES A CAT 50 TAPER SHANK AND IS EQUIPPED WITH TWO STRAIGHT FLUTES. THE UNIT INCLUDES OP4-WC05–50492 SLIDES ATTACHED. THE SPECIFICATIONS IDENTIFY THE PART NUMBER AS 131111-51 AND THE TYPE AS A TWIN BORE BORING MILLING HEAD.