Timco Classic Multi-Purpose Screws are made from A2 Stainless Steel, offering superior performance and ultimate corrosion resistance. They are ideal for fixing into softwoods, pre-drilled hardwoods, chipboard, MDF, and plastic. A2 Stainless Steel is essential for corrosive environments or with inherently corrosive base materials like Green Oak. This product meets CE Standard BS EN 14592:2008 and has a Corrosion Rating 4 for urban and industrial areas with moderate salt atmosphere. Key Specifications: Material: Austenitic Stainless Steel A2-304 Size: 3.5 mm x 40 mm Head Type: Double Countersunk Recess Type: Pozi Driver Bit Size: PZ2 Point Type: 25 degree Sharp with Single Slash Substrates: Hardwood, Softwood, Chipboard, MDF, Plastic, Thin Sheet Metal, Corrosive Wood such as Oak, Cedar Head Diameter: 6.68 mm Inner Thread Diameter: 2.25 mm Thread Diameter: 3.5 mm Thread Length: 35 mm Thread Type: Single Coarse 40 degree.