PARLEC Tool Retention Knob, Series: A1149XPL, 5/8-11, 0.74 in Knob Dia, BT40 Taper, 1.68 in Overall Length, 45 deg Angle Radius, 0.44 in Flange to Angle Length, 0.64 in Flange to Knob Length, Yes Through Coolant (Yes/No)