fasteners swedish wood stainless steel 40mm round head nails nailing external timber cladding a2 stainless steel annular ring shank nailing and fixing bodyguard wood secret nailing you lost head cladding nails 2 65x50mm flat black head ring nails for cladding types of nails and their applications white poly top cladding pins nails upvc cladding anthracite grey head colour 30mm stainless steel cladding pins c