THIS IS AN ALLIED MACHINE & ENGINEERING AMEC GEN3SYS 091211-53 INDEXABLE DRILL. IT FEATURES AN 18MM CUTTING DIAMETER AND A 1” SHANK DIAMETER. THE OVERALL LENGTH (OAL) IS 4.89”, AND THE SHANK LENGTH MEASURES 2.30”. THIS IS A COOLANT-THRU INDEXABLE DRILL DESIGNED WITH TWO FLUTES AND A HELIX GEOMETRY.