Dillon Powder Bar Adjustment Bolts .. Variation on Hex head style with variation on various features that cause NO intended use issues BUT cause aftermarket Hand Knob adjusters NOT to fit securely. 
Nominal Hex size- Both: 0.437" .. 7/16"
OLD Style Hex: Across the flats: 0.433" Across Points 0.495"
NEW Style Hex: Across the flats: 0.428" Across Points 0.477"
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