Retention Knob, 1.50 in. L, 0.91 in. dia., Techniks, Mfr#: 21003-C

Retention Knob, Taper Size CAT40, Thread Size 5/8 In.-11, Angle Radius 45 Degrees , Knob Outside Dia. 0.7400 in, Coolant Fed Coolant Through, Features All Mating Surfaces Precision Ground, Hardened for Maximum Longevity