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#20 Door Screws Head Size is 9/16"
Shank diameter = 0.308" to 0.312", or 5/16"
Quantity
Price Each
#20 Flat Washers, Black Oxide
Price: $0.12
3/8" Dr. X 9/16" 8-Point Socket
Price: $11.88
1/4" Hex to 3/8" Square Drive Adapter, 4"
Price: $10.74
1/2" Dr. X 9/16" 8-Point Socket
Price: $11.70