Our high quality screw usually used to fix the gypsum board with steel frame channel also the steel channel fixing. The popular size: Black phosphor: 3.5x25mm, 3.5x35mm, 3.5x45mm, 3.5x11mm, 3.5x50mm, 3.5x55mm, 3.8x64mm, its with anti oxidized materials. Model: Fine thread/dense carving and Coarse thread/sparse carving. Zinc plated: 4.2x13mm, 4.2x14mm, 4.2x16mm, 4.2x25mm, 4.2x32mm, 4.2x76mm. Model: Cusp end and drill end.

screw set