Black Phosphate Drywall Screw Dia: #6-#14, 3.5-6.3 Length: ... 8-5" Material: 1022 Surface: z/p, black Black Phosphate Drywall ScrewMaterial:carbon steel, alloy steel, stainless steel, copper;Main ... phosphated,grey phosphated,black,white zinc coated,color zinc coated,blue zinc coated...Usage:Drywall screw do much less damage to wood ... you like,warmly welcome your enquires. Black Phosphate Drywall Screw