SAFETY GATE EXTENSION: this 28cm baby gate extension is compatible with the Safety 1st Easy Close, SecureTech and Auto Close gates and allows you to extend the width QUICK & EASY INSTALLATION: seamlessly push the extension into the side of the child gate for smooth installation that requires no drilling – you can add the extension on one side or both sides COMBINING EXTENSIONS: you can combine the available Easy Close Metal extensions (7cm, 14cm and 28cm) on either or both sides to fit the above mentioned safety gates to large openings ASSEMBLY ON STAIRS: if you want to install the child safety gate on a round stair gate railing, we recommend purchasing the appropriate Safety 1st Y-Spindle adapters (sold separately) HOW TO MEASURE: measure the width from the narrowest point of the opening: For a staircase, measure top and bottom of stairs – for a doorway, measure between walls and skirting boards Attention - Please go through the installation manual and user guide available on the amazon website before purchase