1:product summary:aluminum frame+aluminum meshes+plastic lock button 2:specification:398.5*178*9mm 3:outer frame material:silvery white alumina. 4:filtration mesh material:stainless steel face meshes+2layers aluminum meshes 5:lock button:glide pattern plastic lock button. 6:application: a)used for any kinds of european range hood. B)other kinds of range hood of low resistance and ventilative, cleaning system. 7:advantage:top grade, large oil holding capacity, high temperature resistance, long life, easy to install.