... heat treatment Size:3.5-4.8mm / #6-#10 Finish:black/grey phosphated Drywall Screw Application: All(Common and Wide Usege ... : 3.5-4.8mm / #6-#10Thread: M, UNC, UNF, BSWFinish: Black phosphate, black phosphatedPacking: Carton, Box, Bag, Pallet low price drywall screw