Milling Chuck Taper Size BT40 Hole Dia 1-1/4 in Nose Dia 2-3/4 in Projection 4.4400 in Coolant Fed Coolant Through Bore Depth 2-11/16 in Features 56 to 60 HRC Flange-Entry Coolant is the Same as DIN Form B Shiny Taper with Black Oxide Finish for the Best Combination of Accuracy and Durability