Surface Espagnolette Bolts (cassette type)
Surface Espagnolette Bolts work by turning a knob or lever which shoots bolts into staples or plates on the frame and floor, subsequently bolting the door. They are available in different finishes with both lever and knob operating patterns, some types are lockable. This FAQ page discusses a basic cassette system used in these bolts, which makes them left or right handed to suit any door arrangement.

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