This Hauck Open’n Stop stair gate comes with a 9cm extension to be used for widths from 84 to 89 cm. If you wish to secure larger openings (96 - 101 cm), we recommend our Open'n Stop inclusive 21cm extension and for standard openings (75 - 80 cm) the Open'n Stop without any extension. Each model of this gate can be extended with a maximum of two extension extension and up to a maximum width of 122 cm. With Y-spindles, the gate can also be used for round stair railings.Assembly is quick and easy. The metal gate is clamped between walls or in door frames with fixing screws. No drilling required.*Open’n Stop has a double manual locking mechanism. It can be opened with just one hand and engages reliably into the childproof lock.With 9cm or 21cm extensions, the gate can be used flexibly up to a width of 110 cm. In addition, it can also bo combined with our separately available Y-spindles to attach it to landings with round bars (optional).The following dimensions and combinations