... a) smooth surface, security b) quality warranty is for 8 years Features of steel securtity door (high quality, competitive price ... outside and inside9) Doorsill: steel/stainless steel10) Peephole and door bell: various options available11) Interior and exterior availablePacking:Carton ... 2% lock cylinder + 5% other accessories for supplement. steel security door (high quality, competitive price), metal ...