Parlec - Style C CAT40 5/8–11 45° 0.588" Diam Retention Knob – 0.988" Knob to Flange, 0.24" Flange Thickness, 0.393" Neck Diam,

Parlec - Style C CAT40 5/8–11 45° 0.588" Diam Retention Knob – 0.988" Knob to Flange, 0.24" Flange Thickness, 0.393" Neck Diam,