It is compatible with safety 1st simply, easy and auto close pressure fit gates, which fit opening widths of 73 to 80 cm. Free uk delivery on orders over £35. Hager Invicta 3 JK132EG 32 Module Din Rail Extension Board The 14 cm extension is ideal for homes with wider door openings or staircases.Safety 1st baby gate extension 14cm. This extension can be used alone or in combination with other extensions (7cm, 14cm or 28cm). Our pressure fit safety gates by safety 1st