THIS IS A NIKKEN EC45-1-1/4 QUICK CHANGE TOOL HOLDER. IT IS IDENTIFIED BY THE BRAND NIKKEN AND PART NUMBER EC45-1-1/4. THE HOLDER FEATURES A 3-INCH PROJECTION AND AN OVERALL LENGTH (OAL) OF 6.5 INCHES. ITS BORE DIAMETER MEASURES 1.25 INCHES, AND THE BODY DIAMETER IS 2.52 INCHES.