SAFETY GATE EXTENSION: this 7cm gate extension is specifically designed for the Safety 1st Easy Close Metal Black but it's also compatible with the white gates SecureTech Metal, Flat Step and Auto Close; this extension is not compatible with the Extra Tall Gate QUICK & EASY INSTALLATION: Push fit, requires no drilling for easy installation with a solid seal ADD MORE EXTENSIONS: you can combine together more gate extensions (7, 14 cm) to span a variety of opening sizes up to 108 cm wide MEASURING UP: It is important that you measure the opening of where you want to install your safety gate correctly; always measure from the narrowest point, typically skirting to skirting ASSEMBLY ON STAIRS: if you need to install the gate on a staircase, we recommend purchasing the appropriate Safety 1st Y-Spindle adapter (sold separately)