THIS IS A COMMAND B2C4-0020 ER20 COLLET CHUCK. IT FEATURES A CAT30 TAPER FOR COMPATIBILITY. KEY TECHNICAL SPECIFICATIONS INCLUDE THE COLLET SIZE OF ER20, AND DIMENSIONS MEASURED AS D1: 1.38IN, L1: 3.00IN, L2: 3.85IN, AND L3: 0.87IN. THIS TOOLING IS ESSENTIAL FOR PRECISE MACHINING APPLICATIONS.