THE ISCAR CAT40 ER40 SHORT E COLLET CHUCK IS A TOOLING COMPONENT DESIGNED FOR HIGH-SPEED APPLICATIONS. IT IS COMPATIBLE WITH CAT40 SPINDLES AND FEATURES A MAXIMUM ROTATIONAL SPEED OF 20,000 RPM (20K RPM). THIS SPECIFIC PART NUMBER IS CAT40 ER40 SHORT E AND IS DESIGNATED WITH A G2.5 BALANCE GRADE.