Milling Chuck, Taper Size BT50, Hole Dia. 3/4 in, Nose Dia. 2.0400 in, Collet Series KM3/4, Projection 4.133 in, Coolant Fed Coolant Through, Bore Depth 4.13 in, Clamping Range 1/8 in to 3/4 in, Features 140 Percent More Bearing Surface than Competitor Milling Chucks;For Quiet and Stable Heavy Milling;Nikken Patented Design;Nut Body Contact, Nose Clamping and Anti-Vibration Mechanism;Thick Body and Internal Slots Provide Extremely Strong Chucking Torque and Rigidity