SIZE SPECIFICATION: Collet Head Diameter - 65 mm, Taper End Diameter - M16, Collet Head Length - 55 mm, Shank Length - 93.4 mm. TECHNICAL SPECIFICATION: Made from 16MnCr5 Steel, Case hardened to 55-58 HRc (Approx.), Precision Ground accuracy of 0.015 mm TIR, Use C hook to avoid Breakage, Suitable for both Tail and Schaublin Type Collet. HSN CODE: 84669390. PRODUCT CODE: ISO-40-E-40.