THIS ITEM IS A NIKKEN DT454-6 TOOL HOLDER, IDENTIFIED BY THE PART NUMBER DT454-6. IT FEATURES A CAT 45 HOLDER TYPE WITH AN OVERALL LENGTH (OAL) OF 5-1/4 INCHES. THE BORE DIAMETER MEASURES 1/8 INCH, AND THE BODY DIAMETER IS .65 INCHES. IT HAS A PROJECTION LENGTH OF 2 INCHES.