THE PARLEC C40-20ER4 IS A CAT40 COLLET CHUCK. KEY SPECIFICATIONS FOR THIS TOOLING INCLUDE A 4.0 INCH GAGE LENGTH, A 6.75 INCH OVERALL ASSEMBLY LENGTH (OAL) WITHOUT THE BUTTON, AND A BODY DIAMETER OF 1.25 INCHES. THE BRAND IS PARLEC, AND THE PART NUMBER IS C40-20ER4.