drywall screw, chipboard screw gypsum board screw screw Product DescriptionSpecifications: 1) Diameter: 3.5-5.2mm, #6-14 2) Length: 19-150mm, 1-4" 3) Material: C1018/1022 hardened steel with phosphate or zinc plating Inner packing: Small or bulk packaging according to customers' requirements 100pcs-1, 000pcs/box Outer packing: 20-25kg/carton bugle head phillips drywall screw