Milling Chuck Taper Size NMTB50 Hole Dia 1-1/4 in Nose Dia 2.7100 in Collet Series KM1.1/4 Projection 90.00mm Coolant Fed Coolant Through Bore Depth 2.5300 in to 4.1300 in Clamping Range 3/16 in to 1-1/4 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