THIS IS AN AMEC 091211-53 GEN3SYS INDEXABLE DRILL MANUFACTURED BY ALLIED MACHINE & ENGINEERING. KEY TECHNICAL SPECIFICATIONS INCLUDE AN 18MM DRILL END DIAMETER AND AN OVERALL LENGTH (OAL) OF 4.90 INCHES. THE DRILL FEATURES A 1-INCH SHANK DIAMETER AND A SHANK LENGTH OF 2.3 INCHES. THE DRILL BIT HAS 2 FLUTES AND A FLUTE LENGTH OF 2 INCHES. THE HP REFERENCE LENGTH MEASURES 8-51/64 INCHES.