Thank you for viewing. I used this for about a year, but it's no longer needed due to moving. *Instruction manual is not included, so please search online for installation instructions. *One separately sold extension (long, thin board) is included. 【Product Details】 ●Target age: 0-24 months ●Product size: W70 x D2.5 x H75cm *When step cover is attached: D11.5cm ●Installable width: W76-86cm (When installed at the top of stairs: W78-88cm) *Extensions are sold separately. *When installing at the top of stairs or at the bottom of a step, be sure to attach the auxiliary sockets. *For auxiliary sockets, if the wall is gypsum board, use double-sided tape and a gypsum board nail set to secure it firmly. If the wall is a wooden panel or a wooden pillar, secure it firmly with fixing screws. Installable width: When using 1 extension: W86-96cm (Same when installed at the top of stairs) When using 2 extensions: W96-106cm (Same when installed at the top of stairs)