THE GUHRING HSK-A 63 TO GM300 MODULAR TOOL SYSTEM IS COMPRISED OF TWO EXTENSIONS FEATURING A 15° TWIST AND A MODULAR STEP DRILL HEAD. THE SYSTEM INCLUDES AN HSK-A63 HOLDER. THE OVERALL LENGTH OF THE ITEM IS 19-3/8” AND THE INSERT END DIAMETER MEASURES 1.91”. THE SPECIFIC COMPONENTS ARE IDENTIFIED BY GUHRING NUMBERS 12328943, 11964051 (4149—10,150), AND 11963995 (HSK-A63 HOLDER 4142/63,105).