The Jacobs HSK 50 end mill tool holder is designed to hold up to a 6-mm shank cutting tool. It has 65-mm projection. The Jacobs HSK 50A end mill tool holder is used for heavy duty cutting and general milling. The Jacobs HSK 50A end mill tool holder is able to provide more accurate, rigid tool holder-to-spindle mount tapers. The taper is grounded to AT3. Easy changes and set-ups makes the Jacobs HSK 50A end mill tool holder a low maintenance product. The through spindle coolant is standard for all Jacobs end mill tool holders and the Jacobs HSK 50A end mill tool holder comes with a one year factory warranty