THIS IS A COMMAND PART NUMBER C4E4-0375 CAT 40 TOOL HOLDER. THE HOLDER HAS AN OVERALL LENGTH (OAL) OF 5 INCHES WITHOUT THE BUTTON AND 6.5 INCHES WITH THE BUTTON. THE PROJECTION MEASURES 2.375 INCHES. IT FEATURES A BORE DIAMETER OF 0.375 INCHES AND A BODY DIAMETER OF 1.00 INCHES.