The Callowesse Metal Mesh 21cm Extension fits onto the Metal Mesh Safety Gate, allowing you to use the Metal Mesh for wider openings. We recommend you to only attach 1 extension on each side of the gate. Features: Extension for the Callowesse Metal Mesh Safety Gate Ideal for wider openings We recommend you only attach 1 extension on each side of the gate 7cm, 14cm & 28cm extensions are also available to purchase Please Note: This gate should NOT be overextended to fit larger openings - if more than 50% of the fitting pin is exposed when installed, you will need an extension.