The Jacobs BT 50 End Mill Tool Holder is designed to hold up to a 10 mm shank cutting tool. It has 63 mm projection and is prebalanced to 15,000 RPM. The Jacobs BT 50 End Mill Tool Holder is used for heavy duty cutting and general milling. The Jacobs BT 50 End Mill Tool Holder is able to provide more accurate, rigid toolholder-to-spindle mount tapers. The taper is grounded to AT3. Easy changes and set-ups makes the Jacobs BT 50 End Mill Tool Holder a low maintenance product. The Through Spindle coolant is standard for all Jacobs End Mill Tool Holders and the Jacobs BT 50 End Mill Tool Holder comes with a one year factory warranty.