THIS HAUSER HSK40 16MM ITEM IS A SET OF TWO HSK40 SHRINK FIT TOOL HOLDERS, DESIGNED WITH AN HSK40A INTERFACE. THE TOOL HOLDERS FEATURE A 16MM HOLE DIAMETER (D1) FOR CLAMPING. KEY DIMENSIONS INCLUDE AN APPROXIMATE OVERALL LENGTH (OAL) OF 4.32 INCHES AND A LENGTH A OF 3.55 INCHES. THE OTHER SPECIFIED DIAMETERS ARE D2 AT 27MM AND D3 AT 33.5MM, WITH A LENGTH L OF 1.70 INCHES. THESE ARE THE SHORT VERSION TOOL HOLDERS.