THIS IS A MAPAL HSK-A63 SHRINK FIT TOOL HOLDER, IDENTIFIED BY PART NUMBER 30319244. THE SPECIFIC MODEL IS MNC-HSK-A063-12-090-1-0-A. THE TOOL HOLDER FEATURES AN OVERALL LENGTH (OAL) OF 4.75 INCHES. THE ARBOR DIAMETER MEASURES 1.34 INCHES INTERNALLY AND 1.86 INCHES EXTERNALLY. THE OFFERING INCLUDES A SET OF TWO TOOL HOLDERS.