Gypsum Board Screw Dia: #6-#14, 3.5-6.3 Length: 9.5-125, 3/8-5" Material: 1022 Surface: z/p, black ... Gypsum Board ScrewMaterial:carbon steel, alloy steel, stainless steel, copper;Main ... by email or anyway you like,warmly welcome your enquires. Gypsum Board Screw