THIS IS AN EPPINGER PRECI-FLEX D-73770 LIVE TOOL HOLDER, IDENTIFIED BY MODEL NUMBER R78688. THE TOOL HOLDER SUPPORTS A MAXIMUM ROTATIONAL SPEED OF 4000 RPM. THE PHYSICAL DIMENSIONS OF THE UNIT ARE 6-5/8 INCHES IN HEIGHT, 3-3/4 INCHES IN WIDTH, AND 3-3/4 INCHES IN LENGTH. THE MANUFACTURER IS EPPINGER, AND THE PART NUMBER IS PRECI-FLEX D-73770 / R78688.