Milling Chuck, Taper Size BT40, Hole Dia. 1 in, Nose Dia. 2.3600 in, Collet Series KM1, Projection 3.543 in, Coolant Fed Coolant Through, Bore Depth 4.13 in, Clamping Range 1/8 in to 1 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