Black Phosphate Drywall Screw Dia: #6-#14, 3.5-6.3 Length: ... , 3/8-5" Material: 1022 Surface: z/p, black Black Phosphate Drywall ScrewMaterial:carbon steel, alloy steel, stainless steel, copper;Main ... email or anyway you like,warmly welcome your enquires. Black Phosphate Drywall Screw