With this metal extension of 9 cm, the hauck safety gate wood lock, wood lock 2 and stop n safe 2, silver can be rebuilt into a stair gate in the twinkling of an eye the extension is easy to attach to the safety gate by means of a connector all hauck safety gates can be individually combined with one or two extensions of 21 cm and/or 9 cm - one on each side the following opening widths are possible: 84 - 89 cm = gate 9 cm extension 93 - 98 cm = gate 9 cm extension 9 cm extension 96 - 101 cm = gate 21 cm extension 105 - 110 cm = gate 9 cm extension 21 cm extension 117 - 122 cm = gate 21 cm extension 21 cm extension do you have a stair railing with round or oval bars up to a diameter of 10 cm? then you can use the separately available y spindles next to the extensions to safely install your safety gate