Not required., Stainless steel 304 mesh, 6 x 6 mm., Stainless steel 304 mesh, 10 x 10 mm., Stainless steel 304 mesh, 20 x 20 mm., Stainless steel 316 insect screen, 2.3 x 2.3 mm., Stainless steel 316 mesh, 6 x 6 mm., Stainless steel 316 mesh, 10 x 10 mm., Stainless steel 316 mesh, 20 x 20 mm., Burglar resistance louvre - 431RC2.