Hex washer head self drilling screw standard:ANSI B18.6.4 Hex ... Zinc), Nickel, Black/Grey Phosphated, Black Oxide, Hot Dip Galvanized, Machine Galvanized, Dacromet, Delta, Rupert, Magni Package: Small or Color Box ... Head Type:Flat head, Hex flange head or hex washer headAssorted with aluminium washer, EPDM washerSlotted pan head and flat headCounter sunk ...