The Jacobs HSK 63 A Shell/Face mill tool holder is designed to hold up to a 40-mm shank cutting tool. It has a 60-mm projection and is prebalanced to 8,000 RPM. The Jacobs HSK 63 A Shell/Face mill tool holder is designed for heavy duty cutting and face milling. The Jacobs HSK 63 A Shell/Face mill tool holder provides more accurate, rigid tool holder-to-spindle mount tapers. The taper is grounded to AT3. Easy changes and setup make the HSK 63 A Shell/Face mill tool holder a low maintenance product. The through spindle coolant is standard for Jacobs Shell/Face mill tool holders and the Jacobs HSK 63 A Shell/Face mill tool holder comes with a one year factory warranty