THIS IS A SANDVIK COROMANT MODULAR TOOL HOLDER, MODEL CAPTO 8 HOLDER, DESIGNED WITH A CAPTO C8 CONNECTION AND A CAT50 TAPER. THE HOLDER FEATURES AN OUTER DIAMETER (OD) OF 80MM, AN INNER DIAMETER (ID) OF 55MM, AND AN OVERALL LENGTH (OAL) OF 8 INCHES, WITH A PROJECTION OF 3-7/8 INCHES.